Equiluminant

Equiluminant (pronounced ee-kwuh-loom-uh-nuhnt)

(1) In optics, the quality of two or more objects or phenomenon being equally luminant.

(2) Figuratively, two or more people being judged equally illustrious, attractive, talented etc.

1860s: The construct was equi- +‎ luminant.  As an adjective, luminant means "that which illuminates; that which is luminous" while as a noun it describes "an illuminating agent".  Luminant was from the Latin verb lūminant, the third-person plural present active indicative of lūminō, the construct being lūmen, from the Proto-Italic louksmən, from the primitive Indo-European léwk-s-mn̥, from the root lewk- (bright) +‎ -ō (appended to form agent nouns).  The accepted synonym is isoluminant and equiluminescent is the alternative form.  When used figuratively, although it would make no sense in science, the comparative is “more equiluminant” and the superlative most “equiluminant”.  Equiluminant & equiluminescent are adjectives and equiluminance is a noun; the noun plural is equiluminances (which some list as non-standard).

The prefixes: equi-, homo-, peri- & iso-

The prefixes “equi-”, “homo-”, “peri-” & “iso-” are all used to in same way suggest a concept of sameness or equality, but by tradition and convention, are used in different contexts to produce different meanings or emphasis:  Equi- is used to indicate equality, evenness, or uniformity and is often seen in mathematical, scientific & technical publications to describe something is equal in measure or evenly distributed such as equilateral (a shape having all sides of equal length, equidistant (being at equal distances from two or more points) & equilibrium (a state of balance where opposing forces or influences are equal).  Homo- is used to imply “same” or “alike” and thus sameness or (sometimes by degree) similarity.  In technical use it is a standard form in biology, chemistry & the social sciences to indicate sameness in kind, structure, or composition and by far the most common modern use is in the now familiar “homosexual” which in many jurisdictions is now a proscribed (or at least discouraged) term because of negative associations (“homo” as a stand-alone word also having evolved as a slur used of, about or against homosexual men).

The uses of the prefix are illustrated by homogeneous (composed of parts or elements that are all of the same kind, homologous (having the same relation, relative position, or structure) & homonym (in linguistics words which sound the same or are spelled the same but have different meanings).  Iso- is used to denote equality, uniformity, or constancy in terms of specific characteristics like size, number, or configuration and is most used in scientific and mathematical publications.  Examples of use include isometric (having equal dimensions or measurements, isothermal (having constant temperature) & isosceles (having two sides of equal length).  Peri- is used to denote “surrounding or enclosing”, or “something near or around a specific area or object”, examples including perimeter (the continuous line forming the boundary of a closed geometric figure), periscope (an optical instrument for viewing objects that are above the level of direct sight, using mirrors or prisms to reflect the view & peripheral (relating to or situated on the edge or periphery of something.  So equi-focuses on equality in measure, distance, or value, homo- focuses on sameness in kind, structure, or composition, iso- focuses on equality or uniformity in specific characteristics or conditions while peri- :focuses on surrounding or enclosing, or being near or around something.  For most purposes equi- & iso- can be used interchangeably and which is used tends to be a function of tradition & convention.

Equiluminant colors

An example the equiluminant in blue & orange.  In color the text appears at the edges to "shimmer" or "vibrate".  When re-rendered in grayscale, because the value of the luminance is so close, the two shades become almost indistinguishable.

In optics, “equiluminant” is a technical term used to colors with the same (or very similar) luminance (brightness) but which differ in hue (color) or saturation (intensity).  The standard test for the quality is to convert a two-color image to grayscale and, if equiluminant, the colors would appear nearly indistinguishable because they share the same level of “lightness”.  It’s of some importance in fields as diverse as military camouflage, interior decorating, fashion, astronomy and cognitive psychology.  In the study of visual perception, when colors are equiluminant, the human visual system relies primarily on the differences in hue and saturation (rather than brightness) to distinguish between them and this can create challenges in perception; in many cases, the brain will struggle to segregate colors based solely on luminance; essentially, there is a lack of information.

An enigmatic abstraction (2024) by an unknown creator.  This is an example of the use of non-equiluminant shades of orange & blue, the original to the left, copy rendered in gray-scale to the right.

In art and design, the quality of equiluminance can be exploited to create visual effects, the perception of some “shimmering” or “vibrating” at the edges where colors meet actually a product of the way the different hues are perceived by the brain to be “less defined” (a process not dissimilar to the “grayscaling”) and thus “dynamic”, lending the impression of movement even in a static image, especially if seen with one’s peripheral vision.  While a handy device for visual artists, it can be something of some significance because the close conjunction of equiluminant colors can make certain visual tasks more difficult, most obviously reading text or distinguishing shapes and objects.  All that happens is the extent of the luminance contrast can create a perception of fuzziness at the edges of shapes which means some people can suffer a diminished ability to distinguish fine details and the smaller the object (text, numerals or geometric shape), the more acute the problem.  The phenomenon has been well researched, scientists using the properties in equiluminant colors to study how the brain processes color and the findings have been important in fields like instrumentation and the production of warning signs.

Richard Petty's 1974 NASCAR (National Association of Stock Car Auto Racing) Dodge Charger (left) and 3 ton Super-Duty Jack, produced under licence by the Northern Tool Company (right).

1974 was the last year in which the big-block engines were allowed to run in NASCAR and the big-block era (1962-1973) was NASCAR's golden age.  Richard Petty (b 1937) used a "reddish orange" to augment his traditional blue when he switched from Plymouth to Dodge as the supplier of his NASCAR stockers in the early 1970s.  His team was actually sponsored by STP rather than Gulf and STP wanted their corporate red to be used but in the end a "reddish orange" compromise was negotiated.  However, when he licenced the Northern Tool Company to sell a "Richard Petty" jack, the shade used appeared to be closer to the classic "Gulf orange".

Sexy Lamborghinis in a not quite equiluminant color combination following those of the Gulf Western racing teams: 1964 1C TL tractor (top) and 1968 1R tractor (bottom).

Lamborghini had been making tractors and other farm equipment since 1948 when first its track-drive models appeared in 1955, the 1C-TL produced between 1962-1966.  Unrelated to that model cycle, it was in 1966 Lamborghini unveiled the sensational Miura (1966-1973), powered by a transversely located, mid-mounted, 3,929 cm³ (240 cubic inch) V12 engine which sucked prodigious quantities of gas (petrol) through four triple throat downdraft Weber carburetors, each of which was needed to satiate the thirst.  The power was sent to the road via a five-speed transaxle which shared it's lubrication with the engine (shades of the BMC Mini (1959-2000) which turned out to be a bad idea and one not corrected until the final run as the Miura SV (1971-1973).  To achieve the stunning lines, mounting the V12 transversely was the only way to make things fit and the engineering was a masterpiece of packaging efficiency but it resulted in the car displaying some curious characteristics at high speed.  The specification of the 1C TL Tractor was more modest although quite appropriate for its purpose; it was powered by an air-cooled 1,462 cm³ (89 cubic inch) which delivered power to the rear portal axle and drive sprockets via a dual-range, three-speed manual transmission.  However, being a diesel, there was of course fuel-injection (by Bosch), an advance Lamborghini's V12s didn’t receive until 1985 when US emission-control regulations compelled the change.  This version of 1R tractor is known as the cofano squadrato (squared hood (bonnet)); produced between 1966-1969, it replaced the earlier 1R (1961-1965) which featured a rounded hood.  The earlier model seems not retrospectively to have been christened but presumably it would have been the cofano arrotondato (rounded hood), proving everything sounds better in Italian.  An Italian could read from a lawnmower repair manual and it would sound poetic.

Not all agreed all Italians sounded so mellifluous.  In the entry for 10 January 1927 detailing a journey on the Brindisi-Rome train, the novelist Evelyn Waugh (1903-1966) noted in his diary (edited by Michael Davie (1924-2005) and published in 1976): “…a woman with the smile of a Gioconda and the voice of a parrot.  We seem to have stopped at every station in Italy, all decorated with grubby stencilled pictures of Il Duce [Benito Mussolini (1883-1945; Duce (leader) & Prime-Minister of Italy 1922-1943)] looking as if they were advertising Hassals[?] Press Art School.  All common Italian women have voices like parrots.”  By then, maybe the Duce had “made the trains run on time” so there would have been that.  The mention of “Giocondo” was an allusion to the Italian noblewoman Lisa del Giocondo (1479–1542); her name was given to the Mona Lisa, her portrait commissioned by her husband and painted by Leonardo.

A most uncommon Italian: The Mona Lisa (circa 1503), oil on white poplar panel by Leonardo da Vinci (1452–1519).

The John Hassall Correspondence Art School was a London art education institution established early in the 20^th century by the illustrator John Hassall (1868–1948) and Waugh, thinking himself both and “artist” and connoisseur of fine art, had little regard for “commercial art”.  In those years however, there was something of a boom in “poster art” and, with growing demand for graphic artists, the school filled a niche and its popularity (and profitability) increased as correspondence courses, were added, permitting students to learn via mail; conceptually, it was the same idea as “on-line education”.  What came to be called the “Hassall method” (characterized by the flat colors enclosed by thick black lines) would become an identifiable motif in early art deco.  Being quintessentially “upper middle class”, Waugh had to resort to terms like “common”, “lower class” or “lower middle class” to disparage those he thought socially beneath him; unlike members of the upper class (aristocrats, gentry, the genuinely rich etc), he couldn’t hardly use “middle class” as a slur as they could.  On 16 July 1956 he expressed his pleasure the woman buying his house was willing also “…to take over cows and peasants if required.”  Seldom did he miss an opportunity to make some mention of his superior tastes, his entry of 12 February, 1961 recording with obvious glee the “…great pleasure resulting from being rid of servants – one can throw away all the presents they have given one.”  Confident in the discernment of his readers, he didn’t bother to write “ghastly presents”.

As everybody knows, in Mean Girls (2004), there's an example or reference point for just about every known sociological, zoological, linguistic, political, scientific, botanical, geological or cosmological phenomenon yet observed.  Here, Lindsay Lohan in baby pink and powder blue illustrates an instance of equiluminance.

At scale, equiluminance doesn’t have to be obvious for it still to have desirable “side effects” and while it’s often noted two specific hues ((1) the blue Llewellyn Rylands pigments 3707 (Zenith Blue, replicated by Dulux as “Powder Blue”) & (2) the orange Rylands pigments 3957 (Tangerine, replicated by Dulux as “Marigold”)), that their use in combination appears so often on cars, motor-cycles and other stuff with wheels is due less to the claim the shades seem at the edge to “vibrate” that the striking combination appearing on some of the Gulf Oil sponsored Ford GT40s and Porsche 917s during sports car racing’s golden era (1950-1972).  Given the surface area involved, the effect is probably imperceptible when viewed at close range but the science does suggest that at speed (and these were fast machines), at the typical viewing range found on racetracks, there was what the optical analysts call “visual pop”, something which heightens the brain’s perception of motion.

Ford GT40 chassis# 1075, winner of the 1968 & 1969 Mans 24 hour endurance classic in Gulf racing livery.

Gulf's colors were not equiluminescent.  The company's original "corporate color scheme" had been a dark blue & orange combo but Gulf was an acquisitive conglomerate and in late 1967 it took over the Wilshire Oil Company of California, the signature colors of which were powder blue and orange, something which Gulf’s management thought “more exciting” and better suited to a racing car.  The change was made for the 1968 season with the Fords now running as five-litre (305 cubic inch) sports cars, governing body having banned the seven-litre engines the cars previously had used (under a variety of names, motorsport has for decades been governed by some of world sport’s dopiest regulatory bodies).  In the Gulf colors, fitted with 302 cubic inch (4.9 litre) engines, Ford GT40 Mark I (chassis #1075) won the Le Mans 24 hour endurance classic in 1968 & 1969 (repeating the brace Ford had achieved with the 7.0 litre (427 cubic inch) Mark II & Mark IV versions in 1966-1967), the first time the same car had achieved victory twice.  In 1968, #1075 won the BOAC International 500, the Spa 1000-kilometer race, and the Watkins Glen 6-hour endurance race, while in 1969 it also took the Sebring 12-hour race, a remarkable achievement for a race car thought obsolescent.  The livery has since been much replicated, including on many machines which have never been near a race track.

1971 Porsche 917K in Gulf Racing livery.  The fins were added to improve straight-line stability and were strikingly similar to those which appeared on some late 1950s US Chryslers although the aerodynamic properties of those were dubious, despite corporate claims.

Interestingly, the team painting the GT40s were aware of the issue created by equiluminant colors and knew that when photographed in certain conditions, the shades could tend thus.  As a matter of professional pride, they didn’t want it thought they’d created something with “fuzzy edges” so deliberately was added a dark blue hairline-border around the orange, reducing the optical illusion to ensure that when photographed, everything looked painted with precision.  When the Gulf team in 1970 switched to using Porsche 917s for the World Sports Car championship, they adopted the expedient of a black line of definition between the blue & orange so the whole enduring appeal of the combination lies just in the striking contrast and relies not at all on any tendency to the equiluminant.

Ford GT Heritage Edition First Generation (left) and Second Generation (right). 

Little more than 100 GT40s were built but Ford noted with interest the ongoing buoyancy of the replica market, as many as 2,000 thought to have been built in a number of countries (although that's dwarfed by number of replica Shelby American Cobras; it's believed there are 50-60,000-odd of them, a remarkable tribute to the 998 originals).  In the twenty-first century, the company decided to reprise the design but the new GT (2004-2006) was hardly a clone and although it shared the basic mechanical layout and the shape (though larger) was close, it was a modern machine.  The car wasn’t called GT40 because the rights to the name had ended up with another company and Ford declined to pay the demanded price.  Over 4000 were built and one special run was a tribute to the 1968-1969 cars in Gulf livery, 343 of the “Heritage Editions” produced.  A second generation of GTs was produced between 2016-2022 and was very modern, the demands of the wind-tunnel this time allowed to prevail over paying tribute to the classic lines of the 1960s.  Although the supercharged 5.4 litre V8 didn’t return and the new car used a turbocharged 3.5 litre (214 cubic inch) V6, it outperformed all its predecessors over the last 60-odd years (all the original GT40 chassis built between 1964-1969) including the 427 cubic inch monsters that won at Le Mans in 1966 & 1967 so it took decades, but eventually there really was a "replacement for displacement".  The V6 also was used also in pick-up trucks which doesn't sound encouraging but versions of the small & big block V8s used in the GT40s also saw similar service, the latter even first appearing in the doomed Edsel.  Production of the second generation was limited to 1350 units, 50 of which were “Heritage Editions” in the Gulf colors, one of several “limited editions”.

Aphantasia

Aphantasia (pronounced ay-fan-tay-zhuh)

The inability voluntarily to recall or form mental images.

2015: The word (not the diagnosis) was coined by UK neurologist Dr Adam Zeman (b 1957), neuropsychologist Dr Michaela Dewar (b 1976) and Italian neurologist Sergio Della Sala (b 1955), first appearing the paper Lives without imagery.  The construct was a- (from the Ancient Greek ἀ- (a-), used as a privative prefix meaning “not”, “without” or “lacking” + phantasía (from the Greek φαντασία (“appearance”, “imagination”, “mental image” or “power of imagination”, from φαίνω (phaínō) ( “to show”, “to make visible” or “to bring to light”).  Literally, aphantasia can be analysed as meaning “an absence of imagination” or “an absence of mental imagery” and in modern medicine it’s defined as “the inability voluntarily to recall or form mental images”.  Even in Antiquity, there was some meaning shift in phantasía, Plato (circa 427-348 BC) using the word to refer generally to representations and appearances whereas Aristotle (384-322 BC) added a technical layer, his sense being faculty mediating between perception (aisthēsis) and thought (noēsis).  It’s the Aristotelian adaptation (the mind’s capacity to form internal representations) which flavoured the use in modern neurology.  Aphantasia is a noun and aphantasic is a noun & adjective; the noun plural is aphantasics.

Scuola di Atene (The School of Athens, circa 1511), fresco by Raphael (Raffaello Sanzio da Urbino, 1483–1520), Apostolic Palace, Vatican Museums, Vatican City, Rome.  Plato and Aristotle are the figures featured in the centre.

In popular use, the word “aphantasia” can be misunderstood because of the paths taken in English by “phantasy”, “fantasy” and “phantasm”, all derived from the Ancient Greek φαντασία (phantasía) meaning “appearance, mental image, imagination”.  In English, this root was picked up via Latin and French but the multiple forms each evolved in distinct semantic trajectories.  The fourteenth century phantasm came to mean “apparition, ghost, illusion” so was used of “something deceptive or unreal”, the connotation being “the supernatural; spectral”.  This appears to be the origin of the association of “phantas-” with unreality or hallucination rather than normal cognition.  In the fifteenth & sixteenth centuries, the spellings phantasy & fantasy were for a time interchangeable although divergence came with phantasy used in its technical senses of “mental imagery”; “faculty of imagination”; “internal representation”, this a nod to Aristotle’s phantasía.  Fantasy is the familiar modern form, used to suggest “a fictional invention; daydream; escapism; wish-fulfilment, the connotation being “imaginative constructions (in fiction); imaginative excess (in the sense of “unreality” or the “dissociative”); indulgence (as in “speculative or wishful thoughts”)”.

While the word “aphantasia” didn’t exist until 2015, in the editions of the American Psychiatric Association's (APA) Diagnostic and Statistical Manual of Mental Disorders (DSM) published between 1952 (DSM-I) and 2013 (DSM-5), there was not even any any discussion (or even mention) of a condition anything like “an inability voluntarily to recall or form mental images”.  That’s because despite being “a mental condition” induced by something happening (or not happening) in the brain, the phenomenon has never been classified as “a mental disorder”.  Instead it’s a cognitive trait or variation in the human condition and technically is a spectrum condition, the “pure” aphantasic being one end of the spectrum, the hyperaphantasic (highly vivid, lifelike mental imagery, sometimes called a “photorealistic mind's eye”) the other.  That would of course imply the comparative adjective would be “more aphantasic” and the superlative “most aphantasic” but neither are standard forms.

If That rationale for the “omission” was the DSM’s inclusion criteria including the requirement of some evidence of clinically significant distress or functional impairment attributable to a condition.  Aphantasia, in isolation, does not reliably meet this threshold in that many individuals have for decades functioned entirely “normally” without being aware they’re aphantasic  while others presumably had died of old age in similar ignorance.  That does of course raise the intriguing prospect the mental health of some patients may have been adversely affected by the syndrome only by a clinician informing them of their status, thus making them realize what they were missing.  This, the latest edition of the DSM (DSM-5-TR (2022)) does not discuss.  The DSM does discuss imagery and perceptual phenomena in the context of other conditions (PTSD (post-traumatic stress disoder), psychotic disorders, dissociative disorders etc), but these references are to abnormal experiences, not the lifelong absence of imagery.  To the DSM’s editors, aphantasis remains a recognized phenomenon, not a diagnosis.

Given that aphantasia concerns aspects of (1) cognition, (2) inner experience and (3) mental representation, it wouldn’t seem unreasonable to expect the condition now described as aphantasia would have appeared in the DSM, even if only in passing or in a footnote.  However, in the seventy years between 1952-2022, over nine editions, there is no mention, even in DSM-5-TR (2022), the first volume released since the word was in 2015 coined.  That apparently curious omission is explained by the DSM never having been a general taxonomy of mental phenomena.  Instead, it’s (an ever-shifting) codification of the classification of mental disorders, defined by (1) clinically significant distress and/or (2) functional impairment and/or (3) a predictable course, prognosis and treatment relevance.  As a general principle the mere existence of an aphantasic state meets none of these criteria.

Crooked Hillary Clinton in Orange Nina McLemore pantsuit, 2010.  If in response to the prompt "Imagine a truthful person" one sees an image of crooked Hillary Clinton (b 1947; US secretary of state 2009-2013), that obviously wrong but is not an instance of aphantasia because the image imagined need not be correct, it needs just to exist.

The early editions (DSM-I (1952) & DSM-II (1968)) heavily were slanted to the psychoanalytic, focusing on psychoses, neuroses and personality disorders with no mention of any systematic treatment of cognition as a modular function; the matter of mental imagery (even as abstract though separated from an imagined image), let alone its absence, wholly is ignored.  Intriguingly, given what was to come in the field, there was no discussion of the cognitive phenomenology beyond gross disturbances (ie delusions & hallucinations).  Even with the publication of the DSM-III (1980) & DSM-III-R (1987), advances in scanning and surgical techniques, cognitive psychology and neuroscience seem to have made little contribution to what the DSM’s editorial board decided to include and although DSM-III introduced operationalized diagnostic criteria (as a part of a more “medicalised” and descriptive psychiatry), the entries still were dominated by a focus on dysfunctions impairing performance, the argument presumably that it was possible (indeed, probably typical) for those with the condition to lead, full, happy lives; the absence of imagery ability thus not considered a diagnostically relevant variable.  Even in sections on (1) amnestic disorders (a class of memory loss in which patients have difficulty forming new memories (anterograde) or recalling past ones (retrograde), not caused by dementia or delirium but of the a consequence of brain injury, stroke, substance abuse, infections or trauma), with treatment focusing on the underlying cause and rehabilitation, (2) organic mental syndromes or (3) neuro-cognitive disturbance, there was no reference to voluntary imagery loss as a phenomenon in its own right.

Although substantial advances in cognitive neuroscience meant by the 1990s neuropsychological deficits were better recognised, both the DSM-IV (1994) and DSM-IV-TR (2000) continued to be restricted to syndromes with behavioural or functional consequences.  In a way that was understandable because the DSM still was seen by the editors as a manual for working clinicians who were most concerned with helping those afflicted by conditions with clinical salience; the DSM has never wandered far into subjects which might be matters of interesting academic research and mental imagery continued to be mentioned only indirectly, hallucinations (percepts without stimuli) and memory deficits (encoding and retrieval) both discussed only in the consequence of their affect on a patient, not as phenomenon.  The first edition for the new century was DSM-5 (2013) and what was discernible was that discussions of major and mild neuro-cognitive disorders were included, reflecting the publication’s enhanced alignment with neurology but even then, imagery ability is not assessed or scaled: not possessing the power of imagery was not listed as a symptom, specifier, or associated feature.  So there has never in the DSM been a category for benign cognitive variation and that is a product of a deliberate editorial stance rather than an omission, many known phenomenon not psychiatrised unless in some way “troublesome”.

The term “aphantasia” was coined to describe individuals who lack voluntary visual mental imagery, often discovered incidentally and not necessarily associated with brain injury or psychological distress.  In 2015 the word was novel but the condition had been documented for more than a century, Sir Francis Galton (1822–1911) in a paper published in 1880 describing what would come to be called aphantasia.  That work was a statistical study on mental imagery which doubtless was academically solid but Sir Francis’s reputation later suffered because he was one of the leading lights in what was in Victorian times (1837-1901) the respectable discipline of eugenics.  Eugenics rightly became discredited so Sir Francis was to some extent retrospectively “cancelled” (something like the Stalinist concept of “un-personing”) and these days his seminal contribution to the study of behavioural genetics is acknowledged only grudgingly.

Galton in 1880 noted a wide variation in “visual imagination” (ie it was understood as a “spectrum condition”) and in the same era, in psychology publications the preferred term seems to have been “imageless thought”.  In neurology (and trauma medicine generally) there were many reports of patients losing the power of imagery after a brain injury but no agreed name was ever applied because the interest was more in the injury.  The unawareness that some people simply lacked the facility presumably must have been held among the general population because as Galton wrote: “To my astonishment, I found that the great majority of the men of science to whom I first applied, protested that mental imagery was unknown to them, and they looked on me as fanciful and fantastic in supposing that the words “mental imagery” really expressed what I believed everybody supposed them to mean. They had no more notion of its true nature than a colour-blind man who has not discerned his defect has of the nature of colour.”

His paper must have stimulated interest because one psychologist reported some subjects possessing what he called a “typographic visual type” imagination in which ideas (which most would visualize as an image of some sort) would manifest as “printed text” which was intriguing because in the same way a computer in some aspects doesn’t distinguish between an image file (jpeg, TIFF, webp, avif etc) which is a picture of (1) someone and (2) their name in printed form, that would seem to imply at least some who are somewhere on the aphantasia spectrum retain the ability to visualize printed text, just not the object referenced.  Professor Zeman says he first became aware of the condition in 2005 when a patient reported having lost the ability to visualize following minor surgery and after the case was in 2010 documented in the medical literature in the usual way, it provoked a number of responses in which multiple people informed Zeman they had never in their lifetime been able to visualize objects.  This was the origin of Zeman and his collaborators coining “congenital aphantasia”, describing individuals who never enjoyed the ability to generate voluntary mental images.  Because it was something which came to general attention in the age of social media, great interest was triggered in the phenomenon and a number of “on-line tests” were posted, the best-known of which was the request for readers to “imagine a red apple” and rate their “mind's eye” depiction of it on a scale from 1 (photorealistic visualisation) through to 5 (no visualisation at all).  For many, this was variously (1) one’s first realization they were aphantasic or (2) an appreciation one’s own ability or inability to visualise objects was not universal.

How visualization can manifest: Lindsay Lohan and her lawyer in court, Los Angeles, December. 2011.  If an aphantasic person doesn't know about aphantasia and doesn't know other people can imagine images, their lives are probably little different from them; it's just their minds have adapted to handle concepts in another way.

Top right: What’s thought “normal” visualization (thought to be possessed by most of the population) refers to the ability to imagine something like a photograph of what’s being imagined.  This too is a spectrum condition in that some will be able to imagine an accurate “picture”, something like a HD (high definition photograph” while others will “see” something less detailed, sketchy or even wholly inaccurate.  However, even if when asked to visualize “an apple” one instead “sees a banana”, that is not an indication of aphantasia, a condition which describes only an absence of an image.  Getting it that wrong is an indication of something amiss but it’s not aphantasia.

Bottom left: “Seeing” text in response to being prompted to visualize something was the result Galton in 1880 reported as such a surprise.  It means the brain understands the concept of what is being described; it just can’t be imagined as an image.  This is one manifestation of aphantasia but it’s not related to the “everything is text” school of post-modernism.  Jacques Derrida’s (1930-2004) fragment “Il n'y a pas de hors-texte” (literally “there is no outside-text”) is one of the frequently misunderstood phrases from the murky field of deconstruction bit it has nothing to do with aphantasia (although dedicated post-modernists probably could prove a relationship).

Bottom right: The absence of any image (understood as a “blankness” which does not necessarily imply “whiteness” or “blackness” although this is the simple way to illustrate the concept), whether text or to some degree photorealistic is classic aphantasia.  The absence does not mean the subject doesn’t understand the relevant object of concept; it means only that their mental processing does not involve imagery and for as long as humans have existed, many must have functioned in this way, their brains adapted to the imaginative range available to them.  What this must have meant was many became aware of what they were missing only when the publicity about the condition appeared on the internet, am interesting example of “diagnostic determinism”.

WebMD's classic Aphantasia test.

The eyes are an out-growth of the brain and WebMD explains aphantasia is caused by the brain’s visual cortex (the part of the brain that processes visual information from the eyes) “working differently than expected”, noting the often quoted estimate of it affecting 2-4% of the population may be understated because many may be unaware they are “afflicted”.  It’s a condition worthy of more study because aphantasics handle the characteristic by processing information differently from those who rely on visual images.  There may be a genetic element in aphantasia and there’s interest too among those researching “Long Covid” because the symptom of “brain fog” can manifest much as does aphantasia.

Aphantasia may have something to do with consciousness because aphantasics can have dreams (including nightmares) which can to varying degrees be visually rich.  There’s no obvious explanation for this but while aphantasia is the inability voluntarily to generate visual mental imagery while awake, dreaming is an involuntary perceptual experience generated during sleep; while both are mediated by neural mechanisms, these clearly are not identical but presumably must overlap.  The conclusions from research at this stage remains tentative the current neuro-cognitive interpretation seems to suggest voluntary (conscious) imagery relies on top-down activation of the visual association cortex while dream (unconscious) dream imagery relies more on bottom-up and internally driven activation during REM (rapid eye movement) sleep.  What that would seem to imply is that in aphantasia, the former pathway is impaired (or at least inaccessible), while the latter may remain intact (or accessible).

The University of Queensland’s illustration of the phantasia spectrum.

The opposite syndrome is hyperphantasia (having extremely vivid, detailed, and lifelike mental imagery) which can be a wonderful asset but can also be a curse, rather as hyperthymesia (known also as HSAM (Highly Superior Autobiographical Memory) and colloquially as “total recall”) can be disturbing.  Although it seems not to exist in the sense of “remembering everything, second-by-second”, there are certainly those who have an extraordinary recall of “events” in their life and this can have adverse consequences for mental health because one of the mind’s “defensive mechanisms” is forgetting or at least suppressing memories which are unwanted.  Like aphantasia & hyperphantasia, hyperthymesia is not listed by the DSM as a mental disorder; it is considered a rare cognitive trait or neurological phenomenon although like the imaging conditions it can have adverse consequences and these include disturbing “flashbacks”, increased rumination and increased rates of anxiety or obsessive tendencies.

Giallo

Giallo (pronounced jah-loh (often pronounced in English-speaking use as gee-ah-lo)

(1) The industry (and later the public) term for a series of Italian mystery, crime and suspense novels, first published by Mondadori in 1929 and so-dubbed because of the giallo (yellow) hue used for the covers.  They were known as Mistero giallo (yellow mystery) and collectively as the racconti gialli “yellow tales”.  The term “giallo” is a clipping of Il Giallo Mondadori (Mondadori Yellow).

(2) By extension, an unsolved mystery or scandal (historic Italian use).

(3) By later extension, a genre of Italian cinema mixing mystery and thriller with psychological elements and, increasingly, violence.

(4) A film in this genre.

(5) In Italian, yellow. 

1930s (in English use): From the Italian giallo (yellow (although now used also of amber traffic signals)), from the Old French jalne (a variant of jaune), from the Latin galbinus (greenish-yellow, yellowish, chartreuse; effeminate (of men)) of unknown origin but possibly from galbanum, from the Ancient Greek χαλβάνη (khalbánē) (galbanum) (the resinous juice produced by plants of the genus Ferula), from the Hebrew חֶלְבְּנָה (ḥelbənāh), from the root ח־ל־ב (ḥ-l-b) (related to milk), from the Proto-Semitic ḥalīb- (milk; fat).  Over time, the term evolved in Italian language, undergoing phonetic and semantic shifts to become giallo.  As an adjective the form is giallo (feminine gialla, masculine plural gialli, feminine plural gialle, diminutive giallìno or giallétto) and as a noun it refers also to a (1) “a sweet yellow flour roll with raisins” in the Veneto) and (2) “Naples yellow”; the augmentative is giallóne, the pejorative giallàccio and the derogatory giallùccio.  The derived adjectives are nuanced: giallastro (yellowish but used also (of the appearance of someone sickly) to mean sallow); giallognolo (of a yellowish hue) & giallorosa (romantic (of movies)).  The yellow-covered books of the 1930s produced giallista (crime writer which is masculine or feminine by sense (giallisti the masculine plural, gialliste the feminine plural).  The verb ingiallire means “to turn yellow).  Giallo is a noun; the noun plural is giallos or gialli (the latter listed as rare).

In print: A Mondadori Edition.

Arnoldo Mondadori Editore (the Mondadori publishing house, founded in 1907 and still extant) first published their mystery, crime and suspense novels in editions with distinctive yellow covers in 1929.  Few were of local origin and almost all were translations into Italian of works written originally in English by US and British authors and not all were all of recent origin, some having appeared in English decades earlier.  Produced in a cheap paperback format, the giallos were instantly successful (triggering a secondary industry of swap & exchange between readers) and other publishing houses emulated the idea, down even to the yellow covers.  Thus “giallo” entered the language as a synonym for “crime or mystery novel” and it spread to become slang meaning “unsolved mystery or scandal”.  The use as a literary genre has endured and it now casts a wide net, giallos encompassing mystery, crime (especially murders, gruesome and otherwise), thrillers with psychological elements and, increasingly, violence.

In film: The modern understanding of the giallo movie is something like "horror with a psychological theme" and, depending things like the director's intent or the  target market, one or other element may dominate.  Historically, among critics there was a "hierarchy of respectability" in the genre which the psychological thriller tending to be preferred but in recent decades the have been landmark "horror movies" which have made the genre not exactly fashionable but certainly more accepted. 

The paperbacks were often best-sellers and film adaptations quickly followed, the new techniques of cinema (with sound) ideally suited to the thriller genre and these films too came to be called “giallos”, a use which in the English-speaking world tends to be applied to thriller-horror films, especially if there’s some bizarre psychological twist.  The film purists (an obsessive lot) will point out (1) the authentic Italian productions are properly known as giallo all'italiana and (2) a giallo is not of necessity any crime or mystery film and there’s much overlap with other sub-genres (the ones built about action, car-chases and big explosions usually not giallos although a giallo can include these elements.

Lindsay Lohan in I Know Who Killed Me (2007).  Neglected upon its release, IKWKM has since been re-evaluated as a modern giallo and has acquired a cult following, sometimes seen on the playbill of late-night screenings.

IKWKM may at times have been seriously weird but as a piece of film it was mild compared to the most notorious giallo: Salò o le 120 giornate di Sodoma (Salò, or the 120 Days of Sodom) an Italian production directed by Pier Paolo Pasolini (1922–1975) whose talents (and tastes) straddled many fields.  Often referred to as “Pasolini’s Salò”, it’s a film people relate to in the way they choose or the work imposes on them; at one level, it can be enjoyed as a “horror movie” and its depiction of violent sexual depravity is such that of the many strands of pornography which exist, Salò contains elements of most.  As a piece of art it’s polarizing with the “love it” faction praising it as a Pasolini’s piercing critique of consumerism and populist right-wing politics while the “hate it” group condemn it as two hours-odd of depictions of depravity so removed from any socio-political meaning as to be merely repetitiously gratuitous.

Salò poster.

The title Salò is a reference to the film being set in 1944 in Republic di Salò (Republic of Salò (1943-1945)), the commonly used name for the Repubblica Sociale Italiana (Italian Social Republic), a fascist enclave set-up in Nazi-occupied northern Italy under the nominal dictatorship of Benito Mussolini (1883-1945; Duce (leader) & Prime-Minister of Italy 1922-1943) who Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945) had ordered rescued from imprisonment after being deposed as Fascist prime-minister.  As a piece of legal fiction befitting its self-imposed role as Italy’s “government in exile”, Mussolini’s hurriedly concocted state declared Rome its capital but the administration never ventured beyond the region where security was provided by the Wehrmacht (the German military forces, 1935-1945) and the de facto capital was Salò (small town on Lake Garda, near Brescia).

Salò poster.

Although not in the usual filmic sense an adaptation, Pasolini’s inspiration was Les 120 Journées de Sodome ou l'école du libertinage (The 120 Days of Sodom, or the School of Libertinage), an unfinished novel by the libertine French aristocrat Donatien Alphonse François, Marquis de Sade (1740–1814) although the director changed the time and location of the setting (shifting the critique from monarchical France to Fascist Italy) and structurally, arranged the work into four segments with intertitles (static text displays spliced between scenes to give the audience contextual information), following the model of Dante’s (Dante Alighieri (circa 1265–1321)) Divina Commedia (Divine Comedy (circa 1310-1321)).  In little more than a month in 1785, the marquis wrote the text during his imprisonment in the Bastille and while the introduction and first part are in a form recognizably close to what they may be been prior to editing, the remaining three parts exist only as fragmentary notes.  After the revolutionary mob in 1789 stormed the Bastille (and was disappointed to find the Ancien Régime had so few prisoners) it was thought the manuscript had been lost or destroyed but, without the author’s knowledge, it was secreted away, eventually (in severely redacted form) to be published in 1904.

Salò poster.

The work describes the antics of four rich French libertine men who spend 120 days in a remote castle where, attended by servants, they inflict on 20 victims (mostly adolescents and young women) 600 of their “passions”, enacted in an orgy of violence and sexual acts as depraved as the author could imagine; it’s not clear how much of what he documented came from his imagination or recollections (the documentary evidence of what he did as opposed to what he thought or wrote is vanishing sparse) .  Like Pasolini’s film, as a piece of literature it divides opinion on the same “love it” or “hate it” basis and when in the post-war years it began to appear in unexpurgated form (over the decades many jurisdictions would gradually would overturn their ban on its sale) it attained great notoriety, both as “forbidden fruit” and for its capacity genuinely to shock and appal.  The stated purpose of the 1904 publication by a German psychiatrist and sexologist was it was had a utility as a kind of “source document” for the profession, helping them to understand what might be in the minds of their more troubled (or troublesome) patients.  It’s value to clinicians was it constituted a roll-call of the worst of man’s unbridled sexual fantasies and impulses to inflict cruelty, allowing a “filling-in of the gaps” between what a patient admitted and what a psychiatrist suspected, a process something like Rebecca West’s (1892–1983) vivid impression of Rudolf Hess (1894–1987; Nazi Deputy Führer 1933-1941) after observing him in the dock during the first Nuremberg Trial (1945-1946): “He looked as if his mind had no surface, as if every part of it had been blasted away except the depth where the nightmares live.”

Salò poster.

So for the profession it was a helpful document because uniquely (as far as is known), it documented the thoughts and desires which most repress or at least leave unstated although the awful implication of that was that wider publication may not be a good idea because it might “give men ideas and unleash the beast within”.  Certainly, it was one of literature’s purest expressions of a desire for a freedom to act unrestricted by notions such as morality or decency and while those possibilities would seduce some, most likely would agree with the very clever and deliciously wicked English philosopher Thomas Hobbes (1588-1679) who in Leviathan (1651) described life in such a world being “solitary, poor, nasty, brutish, and short.”  De Sade was reportedly most upset at the loss of the manuscript he’d hidden within the Bastille but resumed writing and political activism under the First Republic (1789–1799) and in Napoleonic France (1799–1815) but his pornographic novels attracted the attention of the authorities which again imprisoned him but, after sexually assaulting youthful inmates he was diagnosed with libertine dementia and confined to lunatic asylums where, until his death in 1814, he continued to write and even stage dramatic productions, some of which were attended by respectable parts of Parisian society.

Salò poster.

Passolini followed De Sade in having his four central characters represent the centres of authority (the Church, the law, finance and the state) in Italy (and, by extension, Western capitalist states generally) and Salò genuinely can be interpreted as a critique of modern consumerism, the exploitative nature of capitalism and right-wing populism.  In setting it in the rather squalid vassal state Hitler set up to try to maintain the illusion of an ally being retained, Passolini made fascism a particular focus of his attack but the allegorical nature of the film, politely noted by most critics and historians has always been secondary to the violence and depravity depicted.  For some amateur psychologists, Salò was there to reinforce their worst instincts about Pasolini, their suspicion being it was an enactment of his personal fantasies and imaginings, a record in cellulose acetate of what he’d have done had he “been able to get away with it”.  Whether or not that’s though fair will depend on one’s background and the extent to which one is prepared to separate art from artist; as an artist, Pasolini to this day had many admirers and defenders.

Salò poster.

Three weeks before Salò’s predictably controversial premiere, at the age of 53, Pasolini was murdered, his brutally beaten body found on a beach; a 17 year old rent-boy (one of many who had passed through Passolini’s life) confessed to being the killer but decades later would retract that statement.  The truth behind the murder still isn’t known and there are several theories, some sordid and some revolving around the right-wing terrorism which in Italy claimed many lives during the 1970s.  What the director’s death did mean was he never had a chance to make a film more explicit than Salò and in may be that in the Giallo genre such a thing would not have been possible because the only thing more shocking would have been actual “snuff” scenes in which people really did die, such productions legends of the darkest corners of the Dark Web although there seems no evidence any have ever been seen.  What Pasolini would have done had he lived can’t be known but he may not have returned to Giallo because, in the vein, after Salò, there was really nowhere to go.

Yellow as a color

Lamborghinis in Giallo Fly, clockwise from top left: 1969 Miura P400 S, 1973 Jarama 400 GT, 1988 Jalpa and 1976 Countach LP400 Periscopio,  A solid yellow color first offered by Lamborghini on the Miura in 1968, Giallo Fly translates literally as "yellow fly" but is best understood in English as “Fly Yellow” with the “fly” element used not as a noun (ie the annoying insect) but in the way Italians use the English adjective “fly” with the sense of “flashy, stylish, eye-catching”.  That sentiment must have been in the mind of the Jalpa owner who had the wheels also finished in Giallo Fly, the factory never that committed to monochromaticity. 

Publicity shot for Lamborghini LP500 Countach, 1971.

The Lamborghini LP500 Countach prototype which, on debut, made such an impact at the 1971 Geneva Show Salon, is sometimes listed as being painted in Giallo Fly but it was really a different mix, listed in the factory archives as Giallo Fly Speciale.  The lines are now essentially "supercar orthodoxy" but in 1971, although not wholly novel, they seemed other-worldly.  In 1974, the car was destroyed in a crash test at England’s MIRA (Motor Industry Research Association) facility but in 2021 an almost exact replica was built by Polo Storico (the factory’s historical centre), the paint exactly re-created.  Despite the impression which lingered into the 1980s, giallo was never the “official” color of Lamborghini, but variations of the shade have become much associated with the brand and in the public imagination, the factory’s Giallo Orion probably has become something of a signature shade.  When Lamborghini first started making cars in the early 1960s (it was a manufacturer of tractors!) no official color was designated but the decision was taken to use bold, striking colors (yellow, orange, and a strikingly lurid green) to differentiate them from Ferraris which then were almost twice as likely than today to be some shade of red.

Lamborghini factory yellows, 2024.

Over the years, the factory’s palette would change but the emphasis on bright “energetic” hues remained.  Customers are no longer limited to what’s in the brochure and, for a fee, one’s Lamborghini can be finished in any preferred shade, a service offered also by many manufacturers although Ferrari apparently refuse to “do pink”.  An industry legend is that according to Enzo Ferrari’s (1898-1988) mistress (Fiamma Breschi (1934-2015)), when the original Ferrari 275 GTB (1964-1968) appeared in a bright yellow, it was to be called Fiamma Giallo (Flame Yellow) but Commendatore Ferrari himself renamed it to Giallo Fly (used in the sense of “flying”) which he thought would be easier to market and he wasted to keep a word starting with “F”.  Both Ferrari and Lamborghini at times have had Giallo Fly in their color charts.

Ferrari Enzo (Tipo F140, named after the company's founder: Commendatore Enzo Ferrari (1898-1988)) in Giallo Modena.

Not everybody is fond of yellow cars but there are those who either overlook or like the hue because in January 2026 a 2003 Ferrari Enzo in Giallo Modena realized at auction almost US$18 Million, making it the most expensive Enzo ever across the block.  Record-setting prices for Ferraris are far from unusual but this Enzo nearly tripled the model’s previous mark of US$6.26 million set in 2023.  The sale was achieved at the Mecum Kissimmee event and although observers noted the thing “ticked every box” on the collector car clipboard, the price exceeded all expectations.  Among the many boxes ticked were:

Low mileage (649 miles (1044 km).
Matching numbers: (Serial # 135262; Engine # 79700; Gearbox # 280; Body # 108).
1 of 400 built (2002-2004), 127 of which were delivered in the US.
1 of 36 finished Giallo Modena (paint code DS 4305) 11 of which were delivered in the US.
Factory custom Rosso and Giallo “Daytona style” seats in leather with stitched Enzo Ferrari signature.
Schedoni luggage set.
Ferrari Classiche certified with Red Book.
A number of unique features installed by the factory including polished engine bay braces and body-color lower trim & rear diffuser panel (rather than the usual black).

All original paperwork including window sticker, bBooks, manuals & tools along with a binder of photographs, supplementary documentation and a car cover.

1962 Ferrari 250 GTO in Bianco Speciale.

Only time will tell whether the Enzo's sale price will be an outlier or prove part of what’s claimed to be “a trend” in which was part of a larger trend in which the rarest and most desirable of the later model “analog” Ferraris are beginning to rival the historical dominance of the pre-modern (pre 1973) cars.  It can be hard to pick a “trend” from “a phase the market is going through” and was interesting was the sale at the same auction for US$38.5 million of the most analog of all Ferraris: a 1962 250 GTO.  The GTO was notable for being the only one of the three-dozen odd made (there a different ways of calculating the build but most NRS (normally reliable sources) quote 36) finished in Bianco Speciale and thus “the only white 250 GTO”; while US$38.5 million is a lot of money, expectation had been it may be bid well over US$50 million.  The car had a solid but not exceptional period history and it was thought the genuine uniqueness of the paint may nudge things quite high (a 250 GTO has sold for over US$70 million) but as well as the vagaries of the supply & demand, factors influencing the result were thought to be (1) the non-original engine and (2) it being RHD (right-hand drive).  Still, it’s a 250 GTO and at that price may yet prove a bargain.

1967 Ferrari 275 GTB/4 NART Spider (Chassis #09437) in Giallo Solare (left), Lady Gaga (the stage-name of Stefani Joanne Angelina Germanotta (b 1986)) in Rodarte dress at the Elton John AIDS Foundation Academy Awards Viewing Party, Los Angeles, March 2022 (centre) and 2010 Ferrari 599 SA Aperta (chassis #181257) in Giallo Lady Gaga (right).

Factory paint tag: Giallo Lady Gaga.

Ferrari over the decades have offered many shades of yellow including Ardilla Amarillo, Ardilla Amarillo Opaco, Giallo Dino, Giallo Fly, Giallo Kuramochi, Giallo Lady Gaga, Giallo Libano, Giallo Modena, Giallo Montecarlo, Giallo Montecarlo Opaco, Giallo My Swallow, Giallo Nancy, Giallo Senape, Giallo Solare, Giallo Triplo Strato & Yellow Olive Magno Opaco and one suspects the job of mixing the shades might be easier than coming up with an appropriately evocative name.  One color upon which the factory seems never to have commented is Giallo Lady Gaga which seems to have been a genuine one-off, applied to a 599 SA Aperta, one of 80 built in 2010.  The car is seen usually in Gstaad, Switzerland and the consensus is it was a special order from someone although quite how Lady Gaga inspired the shade isn’t known.  As a color, it looks very close to Giallo Solare, the shade the factory applied to the 275 GTB/4 NART Spider used in the Hollywood film The Thomas Crown Affair (1968) which was re-painted in burgundy because the darker shade worked better for the cinematographer.  The car had come second in class in the 1967 Sebring 12 Hours (with two female drivers) and was one of only two of the ten NART Spiders will aluminium coachwork.

Coat of arms of the municipality of Modena in the in the Emilia-Romagna region of northern Italy (left), cloisonné shield on 1971 Ferrari 365 GTB/4 Daytona Berlinetta in Giallo Dino (centre) (the band of silver paint across the nose appears on the early-build Daytonas fitted with the revised frontal styling (the acrylic headlight glass covers used between 1968-1970 were banned by US regulations) and stick-on badge on 1975 Dino 308 GT4 in Rosso Corsa (right).  Not all approve of the stickers (unless applied by the factory) and although they seem to be dying off, there are pedants who insist they should never appear on Dinos made between 1967-1975 (which were never badged as Ferraris).

Lindsay Lohan in a yellow piece from Stella McCartney's (b 1971) Spring 2025, the New York Post's Alexa magazine, 5 December, 2024.  The closest match to this color on Lamborghini's chart would be Giallo Spica.

Just as yellow came to be associated with Lamborghini, red is synonymous with Ferraris and in 2024, some 40% are built in some shade of red, a rate about half of what was prevalent during the 1960s.  The most famous of Ferrari’s many reds remains Rosso Corsa (racing red) and that’s a legacy from the early days of motor sport when countries were allocated colors (thus “Italian Racing Red”, “British Racing Green” etc) and yellow was designated for Belgium and Brazil.  On the road and the circuits, there have been many yellow Ferraris, the first believed to been one run in 1951 by Chico Landi (1907-1989) a Brazilian privateer who won a number of events in his home country and the Belgium teams Ecurie Nationale Belge and Ecurie Francorchamps both used yellow Ferraris on a number of occasions.  If anything, yellow is at least “an” official Ferrari color because it has for decades been the usual background on the Ferrari shield and that was chosen because it is an official color of Modena, the closest city to the Ferrari factory, hence the existence of Giallo Modena.