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”.

Zettai ryouiki

Zettai ryouiki (pronounced Zah-thai-rye-ouk-i)

(1) In an anime game (dating from 1995), an asset obtainable which playing which afforded the player something like the “invulnerability” or “unlimited damage” concepts familiar in gaming.

(2) As pop culture slang in women’s fashion (dating from 2014), the area of visible bare skin above the socks (classically the above-the-knee variety) but below the hemline of a mini-skirt, shorts or top.

1995: From the Japanese 絶対領域 (zettai ryōiki) (literally “absolute territory” and used variously in anime gaming (and the surrounding cultural milieu) and pop-culture fashion.  The form of Romanization most common in the West is zettai ryouiki, the alternative spelling zettai ryōiki (ぜったいりょういき).  Zettai ryouiki is a noun.

A often heard phrase in English ie “the (French / Germans / Jews / Koreans etc) have a word for everything”.  It’s not literally true and given the huge size of the English vocabulary it’s probably more true of English than any other.  Nobody is quite sure just how many words there are in English and given the frequency with which words are created and fall from use, there can only ever be estimates.  The Oxford English Dictionary (OED) says there are between 170-200,000 words currently in use but that estimate doesn’t include the most specialized technical and scientific terms or words from regional dialects and other specialized fields.  English of course steals (the polite term among lexicographers is “borrowed”) much from other tongues and were all these and the technical terms and their variants to be included in the count, some have suggested the total might approach a million.  What “the x have a word for everything” implies is a sense of surprise that anyone has a word for a thing or concept which seems variously funny, bizarre or unnecessary.

Sock heights in Japan can all be used with the zettai ryouiki look although the classists insist the genre is restricted to those in over-knee & thigh-high socks.

Zettai ryouiki in the anime tradition.

The term zettai ryouiki began in anime gaming in 1995 with the sense “holy space into which no other can intrude”, much along the same lines as “invulnerability” or “unlimited damage” in other games.  It was obvious transferrable beyond gaming sub-culture and among Japanese youth, entered slang in the context of “one’s own personal space” which others shouldn’t transgress.  Around 2013, the phrase was appropriated to describe the area of visible bare skin above the socks (classically above-the-knee socks) but below the hemline of a miniskirt, shorts or top.  It isn’t certain but the use seems to have been adopted after an advertising agency organized a campaign involving young women, for various commercial purposes, applying temporary tattoos high on their thighs, suggesting they pair the look with dark socks or stockings, the top of the socks and the hem of their mini skirts framing the message.  As a visual device, the intent was to focus on the flesh (and thus the logo) and this the fashionistas replicated although they wanted eyeballs only on their skin.  Within months, the shop Zettai Ryōiki opened in Akihabara, Tokyo, dedicated to long socks and tights.

Zettai ryōiki: Lindsay Lohan exploring the possibilities.  

The original use of zettai ryōiki described only the pairing of a miniskirt with over-knee or thigh-high socks which meant the visible skin area, though not dimensionally specific, existed within narrow parameters.  Conceptually however, the idea eventually encompassed all styles which featured an expanse of skin between the top of the sock and the hem of whatever was worn above although the purists continue to decry the use of shorter socks.  Helpfully, the most uncompromising of the sub-culture provided a mathematical formula in the form of a coefficient which was calculated using (1) the length of the miniskirt, (2) the visible skin and (3) the length of the sock which sits above the knee.  Thus not height-dependent, known as the “golden ratio”, a tolerance of +/- 25% was allowed which permitted slight variations.

The achingly lovely Brigitte Bardot (1934-2025) liked the zettai ryouiki look although she achieved it usually with high leather boots rather than socks.  She appears here with 1968 Chevrolet Corvette (left), 1967 Lancia Flavia Convertible (centre) and circa 1968 Citroën 2CV.

The Corvette is fitted with the “Deluxe Wheelcovers” (Starburst Turbines) available between 1968-1973.  The 1968 units (P01) were unique in having feature lines pointing directly to the cap's centre whereas the ones (P02) subsequently used until the 1974 season had a distinct starburst in the centre cap and that's indicative of the difficulties which can present when attempting a restoration of a 1968 Corvette, a model with an unusually large number of "one year only" components.  With the withdrawal of the P02 option for 1974, never again would wheelcovers be offered for the Corvette.  Unlike many film stars who were drawn to fast or luxurious cars, Bardot seemed usually to prefer smaller machines (although she did for some years own a Rolls-Royce).  Her 1954 Simca 9 Cabriolet was a gift from the manufacturer which sounds generous but it was not a regular model (it was either a prototype for a never-produced cabriolet or a one-off created especially for her (both accounts appearing) and thus couldn’t be sold; in exchange, for several years she undertook promotional activities on their behalf.  Based on the number of photographs which exist, she drove it happily for half a decade before replacing it with a 1959 Renault Floride cabriolet (sold in some markets as the Caravelle).  Her Simca’s 1221 cm³ (75 cubic inch) engine had produced a modest 50 horsepower (HP) but the Renault’s 845 cm³ (52 cubic inch) unit was rated at a mere 37 so clearly she put a premium on style over speed.

Brigitte Bardot posing with her 1954 Simca Type 9 Weekend Cabriolet at the family home, Louveciennes, France, 1955.

Simca described the Bardot cabriolet as the “Aronde Weekend”.  The Aronde was the car on which Simca’s post-war success was based and although the avian name (in French, literally “Swallow”) might hint at the songbird’s elegance in flight, the machine gained its reputation from robustness and practicality although the utilitarian styling was certainly modern and nicely balanced.  Founded in 1934, Simca (Societe Industrielle de Mecanique et Carrosserie Automobile) for more than a decade produced, under licence, slightly modified Fiats but in 1951 the Aronde debuted with demand immediately exceeding supply; continually revised, it remained in production until 1964.  In the way things were then done, the Aronde, as well as the basic four-door sedan, appeared in an array of body styles including two-door station wagons (the Australians producing a four-door variant), vans, pick-ups (utes), coupés (some of them the then fashionable hardtops) and a cabriolet. The cabriolet however didn’t appear until 1957 after the Aronde had been revised to make the structure sufficiently rigid to support the convertible coachwork without needing the extensive modifications which would have rendered series production unviable.  Brigitte Bardot’s cabriolet, based on the original “9 Aronde” was thus a genuine one-off, the aluminum and steel body hand made by the coachbuilder Facel (soon to become famous for the memorable Facel Vegas) and, appropriately, carries serial number 001.  It still exists and is on permanent display at the Lane Motor Museum in Nashville, Tennessee.  Lane specializes in European cars (with a commendable emphasis on the rare, strange and truly bizarre) and, like most of its exhibits, the Simca remains in sound working order; it is, in the jargon of the collector trade, “a survivor”, being wholly original and never having been restored.  After some six years in her hands, the car was passed (either sold or gifted, both tales appear) to her friend and neighbour, the French sculptor César Baldaccini (1921–1998).

Dauphine (César Baldaccini’s first Compression plate (Flat compression) piece in his Compression d'Automobile (Compressed cars) series) was literally a Renault Dauphine (1956-1967) “turned into art” using a hydraulic press; it was first shown in Milan in 1970.

The installation’s other pieces are Compressions cubiques (Cubed compressions), made from the salvaged wrecks of cars of various makes (Simca, Renault, Fiat etc) in what are presumably “designer colors”, the artist’s thing being depictions of shapes (including the human form, in whole or in part) in materials like scrap metal and plastics.  The symbolism was apparently something about the movement’s usual suspects (consumerism, alienation and the wastefulness of capitalist mass-production).  Baldaccini was leading light in the Nouveau Réalisme (“new wave of realism) movement (post-war Europe was a place of political and artistic “movements”) and he’s now best remembered for his many “compression” pieces, most of which were cars which had emerged from the crusher.  It had been the sight of a hydraulic crushing machine at a scrap yard which had inspired the artist and the pieces became his signature, rather as “wrapping” large structures was for Christo (Christo Javacheff (1935–2020)).  The pair encapsulated modern art: Christo wrapped a building and called it “art”, while Baldaccini took a crushed car, put it in a gallery and called it “art”.  Prior to some point in the twentieth century, such antics would have been implausible but after things moved from the critical relationship being between artist and audiences to that between artist and critics, just about anything became possible, thus all those post-war “movements”.

BB & BB:  Ferrari 365 GT4 BB (left) on display at the 1971 Turin Motor Show and Brigitte Bardot, supine, with classic (socks) zettai ryouiki, 1968 (right).

Appearing also in Formula One and sports car racing, between 1973-1996 Ferrari used a flat-12 in a number of road cars.  Pedants insist the engines, rather than being "boxers", were really 180^o V12s ("flattened V12" in the engineer's slang) because of a definitional distinction related to the attachment and movement of internal components; the external shape is essentially identical but the factory was in general a bit loose with the nomenclature on which purists like to insist.  In the UK, Coventry Climax were even more ambitious in developing a flat-16 for the new 3.0 litre (183 cubic inch) limit in Formula One for 1966: it used two 1.5 litre (92 cubic inch) "flattened V8s" joined together but the problems proved insurmountable and the remarkable powerplant never left the test bench.  The first of the road-going flat-12 Ferraris was the 365 GT4 BB (1973-1984), the “BB” long thought to stand for Berlinetta Boxer but Road & Track in 2018 noted RoadRat's publication of an interview with the BB’s designer, Leonardo Fioravanti (b 1938) who admitted it was named after Brigitte Bardot simply because the staff in Ferrari's design office were as besotted with the hauntingly beautiful Mademoiselle as engineers (not all of them men) everywhere.  She was at the time the world's most famous sex symbol and in the pre-TokTok era, that was quite something; "Berlinetta Boxer" was just the factory's cover story (later confirmed on the Ferrari website) and undeniably there's some similarity in the pleasing lines of the two.  Until then "Berlinetta Boxer" was the orthodoxy although there must have been enough suspicion about for someone to speculate the origin might be bialbero, (literally "twin shaft"), a clipping of bialbero a camme in testa (double overhead camshaft (DOHC)) which was from the slang of Italian mechanics.

Kawai Maid Cafe & Bar Akiba Zettai Ryoiki, 3-1-1 Sotokanda 1F Obayashi Bldg., Chiyoda 101-0021 Tokyo Prefecture (IRL (in real life) left; a depiction of them as they might appear when created as robots, right).

Japanese futurists predict that when robotics are sufficiently advanced, among the first humanoid bots in Tokyo's bars and cafés will be those in the style of the zettai ryoiki girls, adding they'll be dimensionally modeled on the basis of anime, not typical female human frames.  The artistic motif will thus be mannerism rather than realism so, the flesh & blood waitresses (left) will be "the inspiration" but their AI (artificial intelligence) controlled robotic replacements will be closer in appearance to those in the image to the right. 

Japanese schoolgirls, long the trend-setters of the nation's fashions, like to pair zettai ryouiki with solid fluffy leg warmers (fluffies).  So influential are they that this roaming pack, although they've picked up the aesthetic, are not real schoolgirls.  So, beware of imitations: Tokyo, April 2024.

Penthouse

Penthouse (pronounced pent-hous)

(1) An apartment or dwelling on the roof of a building, usually set back from the outer walls.

(2) Any specially designed apartment on an upper floor, especially the top floor, of a building.

(3) A structure on a roof for housing elevator machinery, a water tank etc.

(4) Any roof-like shelter or overhanging part.

(5) In real tennis, a corridor having a slanted roof and projecting from three walls of the court.

(6) As mechanical penthouse, a floor, usually directly under a flat-roof, used to house mechanical plant & equipment.

(7) A special-interest magazine, aimed at a mostly male audience and published in several editions by a variety of owners between 1965-2023.

1520–1530: Despite the appearance penthouse is not a portmanteau (pent + house) word.  Penthouse is an alteration (by folk etymology) of the Middle English pentis, pentiz & pendize (and other spellings), from the Old French apentiz & apentis (appendage, attached building), the construct being apent (past participle of apendre (to hang against)) + -iz (the French -is ) from the unattested Vulgar Latin –ātīcium (noun use of neuter of the unattested –ātīcius, the construct being the Latin -āt(us) (past participle suffix) + -īcius (the adjectival suffix)).  Old French picked up apentis from the Medieval Latin appendicium (from the Classical Latin appendo (to hang) & appendere (to hang from).  A less common alternative variant to describe a shed with a sloping roof projecting from a wall or the side of a building was pentice.  Penthouse is a noun & verb, penthousing is a verb and penthoused & penthouslike are adjective; the noun plural is penthouses.  The adjectives penthouseish & penthousesque are non-standard.

Penthouse magazine, December 1993.

First published in 1965, Penthouse magazine was one of many ventures (in many fields) which proved unwilling or unable to adapt to the changes wrought by the internet and the atomization of the delivery of content; its last print edition (after a few stuttering years) appeared in 2023 although there must remain some perception of value in the name because of the decades-long prominence of the title and it's not impossible there will be a revival, even if it's unlikely to re-appear in the glossy magazine format of old.  In Australia, for students of the print industry the comparison between the “men’s magazines” Penthouse and Playboy (first published in 1953, on-line since 2020 and a print “annual edition” appeared in 2025) was something like that between the “women’s magazines” Cosmopolitan (since 1965 in its current niche) and Cleo (1972-2016) in that the two pairings were superficially similar but different in emphasis.  Not too much should be made of that because although identifiably there were “Cosmo women” & “Cleo women” (presumably with some overlap at the margins), between Penthouse and Playboy there were probably more similarities than variations.  Structuralists explained the difference between the two genres: “men’s magazines” were bought by men so they could look at pictures of women not wearing clothes while “women’s magazines” were bought by women so they could look at pictures of women wearing clothes.

View from the penthouse in which Lindsay Lohan lived in 2014, W Residences, Manhattan, New York City.

When the lovely Ms Schiffer appeared on the cover of the December 1993 edition of Penthouse, the editors may not have been aware of the beast which was coming to consume them but it was in April 1993 CERN (in 1953 the Conseil Européen pour la Recherche Nucléaire (European Council for Nuclear Research) but the following year re-named Organisation européenne pour la recherche nucléaire (European Organization for Nuclear Research) with the acronym retained because it was both more mnemonic and pronounceable than OERN) released into the public domain details of technology which would allow the free development of applications using the www (world wide web) which ran atop the internet, making indexed content more easily accessible and distributable.  When in April 1993 the NCSA (National Center for Supercomputing Applications) released version 1.0 of its Mosaic web browser, it triggered a social and industrial revolution which (variously on TikTok, X (formerly known as Twitter), FoxNews and such) continues to unfold.  Mosaic wasn’t the first web browser but it was the first to gain a critical mass and the applications which superseded it claimed many victims including Penthouse magazine.

Iso, the Grifo and the Penthouse

1965 Iso Grifo Bizzarini A3/C, Le Mans, 1965.

One of the most admired of the trans-Atlantic hybrids of the post-war years (1945-1973) which combined elegant coachwork, (hopefully) high standards of craftsmanship and the effortless, low-cost power of large-displacement American V8 engines, the Iso Grifo was produced between 1965-1974 by the Italian manufacturer Iso Autoveicoli.  Styled by Bertone’s Giorgetto Giugiaro (b 1938) with engineering handled by the gifted Giotto Bizzarrini (1926-2023), the Grifo initially used a 327 cubic inch (5.3 litre) version of the small-block Chevrolet V8, coupled with the equally ubiquitous Borg-Warner (four & five speed) manual gearbox or robust General Motors (GM) Turbo-Hydramatic automatics.  Later, after some had been built with the big-block Chevrolet V8, GM began to insist on being paid up-front for hardware so Iso negotiated with the more accommodating Ford Motor Company (FoMoCo) and switched to 351 cubic inch (5.8 litre) versions of their 335 (Cleveland) engine.

1955 Iso Isetta.

Iso was already familiar with the mechanical configuration, production of their Rivolta coupe, equipped also with the Chevrolet 327, having begun in 1962.  The Rivolta, let alone the Grifo was quite a change of direction for Iso which until then had produced a variety of appliances, scooters & moto-cycles, it’s most famous product the Isetta, one of the generation of “bubble cars” which played such a part in putting Europeans back on (three or four) wheels during the re-construction of the early post-war years.  Surprisingly, despite the prominence of the Isetta name and the Italian association, barely a thousand were actually manufactured by Iso, the overwhelming majority produced in many countries by BMW and others to which a license was granted.  The bubble cars were a product of the economic circumstances of post-war Europe and the ones produced in England even used the single rear wheel which had been abandoned by Iso because of the inherent instability; UK taxation laws made three-wheelers significantly cheaper and only a motor-cycle license was required to drive one.  Powered by tiny two and four-stroke engines, their popularity waned as “real” cars such as the Fiat 500 (1955-1975) and later the BMC (British Motor Corporation) Mini (1959-2000) emerged; although costing little more than the bubble cars, they offered more space, performance and practicality.  By the early 1960s, the bubble cars were almost extinct but, as a tiny specialized niche, they never completely vanished and the Isetta is enjoying a twenty-first century revival as model urban transportation, including the option of (Greta Thunberg (b 2003) approved) electric propulsion.  Once dismissed as dated and even absurd, their bug-eyed look is now thought to have "retro-charm".

1968 Iso Rivolta.

The Rivolta was thus quite a jump up-market and, while the engine wasn't the bespoke thoroughbred found in a Ferrari or Aston-Martin, the rest of the specification justified the high price.  Unlike some of the British interpretations using American V8s, Iso insisted on modernity, the platform probably the best of the era with a body welded to a pressed-steel chassis, a combination which proved both light and stiff.  Just as importantly, given the high rate of corporate failure among those attracted to this potentially lucrative market, it was cost-effective to manufacture, reliable and easy to service.  Probably the feature which let it rank with the most accomplished of the era was the sophisticated de Dion rear suspension which, combined with four wheel disc brakes, lent it a rare competence (surprising some Maserati and Ferrari drivers, their cars with rear suspension designs dating from the horse & buggy era).  The de Dion design was not an independent arrangement but certainly behaved as if it was and, despite what Mercedes-Benz claimed of their beloved swing-axles, was superior to many of the independent setups on offer.  A noted benefit of the de Dion system is it ensures the rear wheels remain always parallel, quite an important feature in an axle which has to transmit to the road the high torque output of a big V8, a lesson Swiss constructor Peter Monteverdi (1934–1998) applied later in the decade when he went into production using even bigger engines.  Iso, with a solid base in accounting and production-line economics, ran an efficient and profitable operation not beset by the recurrent financial crises which afflicted so many and the elegant Rivolta was a success, remaining available until 1970.  Some eight hundred were sold.

1967 Iso Grifo Series One.

The Rivolta’s platform proved adaptable.  In 1965, Iso released the Grifo coupé which was more overtly oriented to outright performance and strictly a two-seater.  With lovely lines and a modified version of the Rivolta’s fine chassis, the Grifo was another product of the fertile imaginations of Giugiaro & Bizzarrini but, in something not untypical in Italian industry of the time, the relationship between the latter and Iso’s founder Renzo Rivolta (1908–1966) soon became strained and was sundered.  Bizzarrini would go on to do remarkable things and Iso’s engineers assumed complete control of the Grifo after the first few dozen had been completed.  Bizzarrini had pursued a twin-stream development, a competition version called the A3/C with a lower, lightweight aluminum body as well as the road-going A3/L and when he decamped, he took with him the A3/C, to be released also under his name while Iso devoted its attentions to the A3/L, again using engine-transmission combinations borrowed from the Chevrolet Corvette.

1964 Iso Grifo A3/L Spider prototype by Bertone.

The Grifo weighed a relatively svelte 1430 kg (3153 lbs) in what must have been a reasonably slippery shape because the reports at the time confirmed some 240 km/h (150 mph) was easily attained, an increase on that managed by the C2 Corvette (1962-1967 and which turned out to be not aerodynamically efficient as it looked) and, when configured with the taller gearing the factory offered, the factory claimed 260 km/h (162 mph), was possible.  A test in the UK in 1966 almost matched that with a verified 161 mph (259 km/h) recorded and two years later, the US publication Car & Driver 1968 tested a 327 Grifo but didn't to a top-speed run, instead estimating 157 mph (253 km/h) should be possible given enough road.  There were surprisingly few variations, fewer than two-dozen made with a targa-style removable roof panel and a single, achingly lovely roadster was displayed on Bertone's stand at the 1964 Geneva Motor Show; it remained a one-off although a couple of coupés privately have been converted.  What made the Bertone prototype special however was it was a companion to the original A3/L prototype coupé with which it shared a number of distinctive features including (1) a side exhaust rakishly snaking through the passenger side of the cowl and under the rocker panel trim with its an almost matte finish, (2) frontal styling with the then fashionable “twin-nostril” fascia and (3) angled vents in the rear fenders.  Although visually similar to the series production Grifos, almost every line on the pair of A3/L prototypes was in some subtle way different.

The one-off Iso Grifo Spider on Bertone's stand, 1964 Geneva Salon, 1964 (left) and as discovered in Rudi Klein's famous shed, Los Angeles, 2024 (right). 

Although well-known in the collector community for its large stocks of rusty and wrecked Porsches, Mercedes-Benz and other notable vehicles from the post-war years, the Californian “junkyard” belonging to Rudi Klein (1936-2001) attracted world-wide interest when details were published of the gems which had for decades been secreted in the site's large and secure shed.  Mr Klein was a German butcher who in the late 1950s emigrated to the US to work at his trade but quickly discovered a more enjoyable and lucrative living could be had dealing in damaged or wrecked European cars, sometimes selling the whole vehicles and sometimes the parts (“parting out” in junkyard parlance).  His Porsche Foreign Auto business had operated for some time before he received a C&D (cease & desist) letter from the German manufacturer’s US attorneys, the result being the name change in 1967 to Porche (sic) Foreign Auto.  Unlike many collectors, Mr Klein amassed his collection unobtrusively and, astonishingly to many, apparently with little interest in turning a profit on the rarest, despite some of them coming to be worth millions.  After Mr Klein died in 2001, his two sons preserved the collection untouched until, in October 2024,the auction house Sotheby’s began a series of rolling sales, one to go under the hammer the one-off Grifo spider.  At some point there was an accident which damaged the nose so a standard Grifo facia was installed and in this form Mr Klein ran it for a while as a road car before parking it in the shed among its illustrious companions.  Remarkably original except for the nose, it sold for US$1,875,000 and the expectation is it will be fully restored (including a fabricated replica of the original nose) before appearing on the show circuit.  In the decades to come, it will likely spend its time in collections with the occasional outings to auction houses.

1970 Iso Grifo Targa (left) Series Two and 1971 Iso Grifo Can-Am (454) Targa.  Only four Series II Can-Ams were built with the targa roof.

The bodywork was revised in 1970, subsequent cars listed as Series Two models.  The revisions included detail changes to the interior, improvements to the increasingly popular air-conditioning system and some alterations to the body structure, the hydraulics and electrical system, some necessitated by new regulatory requirements in Europe but required mostly in an attempt to remain compliant with the more onerous US legislation.  The most obvious change was to the nose, the headlamps now partially concealed by flaps which raised automatically when the lights were activated.  Presumably the smoother nose delivered improved aerodynamics but the factory made no specific claims, either about performance or the drag co-efficient (CD) number.

1972 Iso Lele & 1972 Iso Fidia.

In 1972, an unexpected change in the power-train was announced.  After almost a decade exclusively using Chevrolet engines, Iso issued a press release confirming that henceforth, the Series Two Grifo would be powered by Ford’s Boss 351 cubic inch (5.8 litre) 335 series (Cleveland) V8.  In the state of tune (close to that fellow Italian specialist De Tomaso were using in their mid-engined Pantera) chosen, the Ford engine was similar in size, weight to the small-block Chevrolet and delivered similar power and torque characteristics so the driving experience differed little although there were 22 high-performance Leles using a tuned 351, all with a ZF five-speed manual gearbox.  The other improvement in performance was presumably Iso’s balance sheet.  The switch had been made because internal policy changes at GM meant they were now insisting on being paid up-front for their product whereas Ford was still prepared to mail an invoice with a payment term.  The change extended to the other models in the range, the Lele coupé and Fidia saloon and while the Chevrolet/Ford split in the Lele was 125/157, the circumstances of the time meant that of the 192 Fidias made, only 35 were fitted with the 351.

1969 Iso Grifo 7 Litre (427).

One of the trends which made machines of the 1960s so memorable was a tendency never to do in moderation what could be done in excess.  In 1968, Iso announced the Grifo 7 Litre, built following the example of the US manufacturers who had with little more than a pencil and the back of an envelope worked out the economics of simple seven litre engines were more compelling than adding expensive components like overhead camshafts and fuel-injection to five litre engines; in the US, gas (petrol) was then relatively cheap and and assumed by most to be limitless.  Gas wasn’t as cheap in Italy or the rest of Europe but Iso’s target market for the Grifo was those who either could afford the running costs or (increasingly) paid their bills with OPM (other people’s money) so in those circles fuel consumption wasn’t something often considered or much discussed.  The new version used a 427 cubic inch (7.0 litre) version of the big-block Chevrolet V8, bigger and heavier than the 327 so the driving characteristics of the nose-heavy machine were changed but contemporary reports praised the competence of the chassis, the de Dion rear-end notably superior in behavior compared with the Corvette’s independent rear suspension although some did note it took skill (which meant often using some restraint) effectively to use the prodigious power.  Tellingly, the most receptive market for the Grifos, small and big-block, was the  FRG (Bundesrepublik Deutschland (Federal Republic of Germany; the old West Germany) 1949-1990) with its network of highways without the tiresome speed limits elsewhere imposed and (even in Italy), often enforced.  The Autobahn really was the Grifo's native environment.

1971 Iso Grifo Can Am (454).

Faster it certainly was although the factory’s claim of a top speed of 186 mph (a convenient 300 km/h) did seem optimistic to anyone with a slide-rule and there appears not to be any record of anyone verifying the number although one published test did claim to have seen well over 255 km/h (150 mph) with the Grifo still "strongly accelerating" before “running out of road”.  It had by then become a genuine problem.  Gone were the happy times when testers still did their work on public roads; increased traffic volumes by the late 1960s meant the often deserted stretches of highway (in 1956 an English journalist had taken a Mercedes-Benz 300SLR Coupé to 183 mph (294 km/h) on the autobahn) were now rare but whatever the terminal velocity, nobody seemed to suggest the 7 litre Grifo lacked power.  In 1970, after Iso’s stock of the by-then out-of-production triple carburetor 427 were exhausted, the big-block car was re-named Can-Am and equipped instead with a 454 cubic inch (7.5 litre) version, the name an allusion to the unlimited displacement Group 7 sports car racing series run in North America in which the big-block Chevrolets were long the dominant engine.

Despite the increased displacement, power actually dropped a little because the 454 was detuned a little to meet the then still modest anti-emission regulations.  Officially, the 454 was rated at 395 HP (gross horsepower) but the numbers in that era were often at best indicative: The Boss 429 Mustang was said to produce 375 HP whereas the 500 cubic inch (8.2 litre) V8 in the FWD! (front-wheel-drive) Cadillac Eldorado was rated at 400; a comparison of their performance belies the numbers and the difference is not all accounted for by the Eldorado's weight and power-sapping accessories.  As early as the the mid-1960s Detroit had begun understating the output of many of their high-performance engines and as politicians and insurance companies (for their own reasons) became interested, the trend continued.    

1971 Iso Grifo Can Am (454).

Unlike the 427 which breathed through three two barrel carburetors, the 454 was equipped with less intricate induction, a single four barrel and while with output (officially) dropping from 435 to 395 HP, performance was s little blunted although it's probable few owners often went fast enough to tell the difference.  What didn’t change between the 7 Litre and the Can Am was its most distinctive feature, the modification to the hood (bonnet) made to ensure the additional height of the 427's induction system could be accommodated.  The raised central section, the factory dubbed "the penthouse".

Penthouse on 1969 Iso Grifo 7 Litre (427).

Not everyone admired the stark simplicity, supposing, not unreasonably, Giugiaro might have done something more in sympathy with its surroundings.  Critics more stern would have preferred a curvaceous scoop, blister or bulge and thought the penthouse amateurish, an angular discordance bolted unhappily atop Giugiaro’s flowing lines  but for those brought up in the tradition of brutalist functionalism, it seemed an admirable tribute to what lay beneath.  The days of the big-block Grifo were however numbered.  In 1972, with Chevrolet no longer willing to extent credit and Ford’s big-block (429 & 460) engines re-tuned as low-emission (for the time) units suitable for pickup trucks and luxury cars, the Can-Am was retired.  So the small-block 351 Grifo became the sole model in the range but it too fell victim to changing times, production lasting not long beyond the first oil shock (triggered by the OAPEC (Organization of Arab Petroleum Exporting Countries) on 17 October 1973 imposing an embargo on crude oil exports to certain countries) which made gas suddenly not only much more expensive but sometimes also scarce and the whole ecosystem of the thirsty trans-Atlantic hybrids became threatened; in little more than a year, Iso was one of the many dinosaurs driven extinct.  Decades later, the survivors of the 414 sold are highly desirable; fine examples of the small-block Grifos attract over US$500,000, the few dozen penthouse have sold for close to a million and the rare early A3/Cs for even more.

From the lost, tactile days of buttons and toggle switches: 1966 Iso Grifo, one of 31 built in RHD (right hand drive).

Not fans of brutalist functionalism were the Lancia-loving types at Road & Track (R&T) magazine in the US.  Late in 1974, R&T published their 1975 buyer’s guide for imported and domestically-built smaller cars (R&T neither approving of nor understanding why anyone would wish to buy a big American car) and surprisingly, there were reviews of the Grifo, Lele and Fidia although the last of these sold in the US some two years earlier had been titled as 1973 models, the company having never sought to certification to continue sales although, given nothing had been done to modify them to meet the new safety regulations, that would likely have been pointless unless the strategy was to seek a "low volume" exemption, something improbable by 1975.

A tale of two penthouses: Paradoxically, as installed in the Grifo the induction system of the big-block Chevrolet V8 sat a little lower than that of the small-block Ford (a not unusual anomaly in the small-block vs big-block world) so the Ford-engined Grifos (right) used a taller penthouse than those fitted with the Chevrolet unit.     

The distributors had however indicated to the press all three would return to the US market in 1975, supplying publicity photographs which included a Series II "penthouse" Grifo.  A further complication was that during 1974, Ford had discontinued in the US production of the high-performance 351 (the "Cleveland" 335 series which was exiled to Australia) V8 so it wasn't clear what power-train would have been used.  Others had the same problem, De Tomaso (which withdrew from the US market in 1974) switching to use tuned versions of the Australian-built 351s but for Iso, the whole issue became irrelevant as the factory was closed late in 1974.  R&T's last thoughts on the penthouse appeared in the buyer's guide: "However, the clean lines of the original Grifo have been spoiled by that terrible looking outgrowth on the hood used for air cleaner clearance.  For US$28,500 (around US$155,000 in 2025 US$ although direct translation of value is difficult to calculate because of the influence of exchange rates and other variables), a better solution to this problem should have been found."