Entasis

Entasis (pronounced en-tuh-sis)

(1) In architecture, a slight convexity given to a column or tower, claimed to correct the optical illusion of concavity and create the perception of straight lines.

(2) In medicine and physiology, an involuntary or spasmodic muscular contraction (also called entasia (from the Greek ɛnˈteɪzɪə)).

(3) In typography & calligraphy, the thinning in the waist of a stroke, the technique used to compensate for the visual perception of a stroke with perfectly straight sides appearing slightly to bulge.

1745–55: From the Latin entasis, from the Ancient Greek ἔντασις (éntasis) (tension, straining), from εντείνω (enteínō) (to stretch or strain tight), the construct being enta, variant stem of enteínein (to stretch tight) + teínein (to stretch) + sis.  The –sis suffix was from the Ancient Greek -σις (-sis) and was attached to words in English often via Latin or French.  It was identical in meaning with the Latin –entia and the English –ing and was used (1) to form nouns of action or process (catharsis, dialysis, diagnosis, crisis etc), (2) in medicine to form nouns of condition (psoriasis, sepsis, tuberculosis, psychosis etc) and more generally (3) nouns as required (basis, oasis, thesis, stasis etc).  Entasis is a noun; the noun plural is entases.

The Entasis or Parthenon Principle

The Parthenon in Athens; it's the most celebrated use of entasis.

In modern architecture, entasis is the application of a convex curve to a surface for aesthetic purposes.  Its best-known use is in the columns from antiquity which curve slightly as their diameter is decreased from the bottom upward.  Because no relevant documents have yet been discovered, it’s not known whether the architects in antiquity applied the technique for aesthetic effect or as an engineering technique to enhance strength.  The latter is suggested by the design principle being described by Roman architect Marcus Vitruvius Pollio (circa 75 BC–circa 20 BC) using the Greek word enteino (to stretch or strain tight), suggesting some emphasis on structural strength rather than appearance.  However, until contemporary records are uncovered, their reasons for using entasis remain mysterious, hence the two-thousand odd years of conjecture.  The earliest known documented view of the matter was that written by Greek mathematician and engineer Hero of Alexandria (circa 10-circa 70), is that entasis corrects the optical illusion of concavity in the columns that the human eye would create if the correction were not made.  

Basilica's western front of the Second Temple of Hera, a Greek temple in Paestum, Campania, Italy.

The Second Temple of Hera (circa 55 BC) was built in the Doric order, just north of the first.  For the visual effect of entasis to work, the convex curve has to be so slight as to be imperceptible and it's not known why the Second Temple of Hera has an entasis so pronounced the curvature is obvious; there is illusion of straightness.  The proportions are such that historians have speculated it must have been deliberate (presumably for structural strength) but it's at least possible the architect was afflicted by the desire many of his modern contemporaries share: The wish to produce something "original" and "new", the reason why so many modern buildings are so unpleasing to the eye, architectural awards & prizes handed out not for beauty and elegance but novelty and shock.

For millennia, entasis and its place in the history of architecture has been one of the most persistent tales from Antiquity but there have long been contrarians prepared to argue the concept, while not exactly a myth, is greatly exaggerated in significance.  In September 2026, Belgian mathematician Professor Alain Goriely (b 1967; professor of mathematical modelling at the University of Oxford) published the findings of his study, challenging the belief the Parthenon’s “curves” were included to correct “optical illusions” that would have made pure straight lines appear “distorted”.  What the professor’s modelling was said to reveal was (1) the “curves” are practically imperceptible and the alleged “illusion” they were claimed to correct doesn’t exist; “the illusions are illusory”.  Deconstructing Vitruvius, the study begins with the claim the sides of the Parthenon’s stylobate (base) are not horizontal but form a very flat “V”, rising gently 60 mm (2.36 inches) towards the centre.  According to Vitruvius, this was to correct the illusion that, when viewed as a whole, the base appears to “sag in the middle”.  For centuries, the “sagging effect” was attributed to one of two “tricks of the light”: (1) That because of the way light is interpreted by the human brain, long horizontal lines “appear to slump” towards the centre or (2) That the structure’s marble columns create the illusion; this based on the “Hering illusion” (where in 2D (two dimensions) parallel lines can appear “bowed” when intersected by other lines).  Professor Goriely found nothing to support either proposition, noting the Hering illusion (discovered in 1861 by German physiologist Ewald Hering (1834--1918) is most apparent when lines intersect at acute angles and the Parthenon’s columns are anyway “too close to the vertical” to produce the illusion.  Additionally, extensive modelling produced no proof the effect would manifest on the Parthenon even in 3D (three dimensions), viewed from any angle.

The persistent claims of entasis.

Those details were really footnotes in architecture textbooks, entasis the most famous of the legends.  What that suggests is “bulges” in the Parthenon’s columns (the curvature called entasis) were included by the builders to correct an optical illusion that would make them appear “too narrow” in the middle.  Not only did Professor Goriely found no evidence the illusion exists but the columns bulge by a mere 18 mm (less than ¾ inch) which, at that scale, is simply not perceptible to the human eye at a typical viewing distance.  What he doesn’t dispute is the architects may have had some reason to include variations in the dimensions; it’s just he found no evident they were there as “optical correctives”, the slopes on the base perhaps there for a reason as mundane as preventing puddles forming after rain; as every builder knows, only a very slight incline is needed for water to flow.  The very minor increase in width in the columns’ centre sections is more mysterious and may have been something to do with what would have been a very labor-intensive production process but there seems to be no optical effect.

Beyond the math, Professor Goriely speculates the reason the myth has proved so enduring was the extraordinary level of veneration granted to the engineers, philosophers and architects of Antiquity when, in the late Medieval period and (especially) the Renaissance, so many of the texts were “re-discovered” and a the perception emerged of Ancient Greece as a supremely knowledgeable and ingenious civilisation.  For centuries, in Western Europe, the Classical World was idealized and unless explicitly disproved (as came to be done of their medicine, cosmology and such), the texts were treated with great respect, thought something of “Civilization’s gold standard”.  In the modern age, the veracity of what Vitruvius wrote tended to be reinforced by internet users repeating the tale, search engines affording a greater credibility to “facts” appearing in the greatest volume.  Now of course, AI (artificial intelligence) bots have centuries of architectural texts from which to harvest information and given what Vitruvius who wrote about the Parthenon (400 years after its construction), came to be treated as something “scriptural” (despite the loss of loss of the many Greek texts about their temple architecture he claimed to have read when preparing his own), the authority was strengthened.  Untypically for an academic paper, the professor recommends not too much dwelling on his findings but commending instead: “Trust your own eyes, question what you see and decide for yourself whether the theory of optical corrections holds up.”  Professor Goriely concluded entasis “might be the oldest myth that we have” before mischievously adding “apart from religion.”

1964 Rolls-Royce Silver Cloud III Flying Spur; coachwork by H.J. Mulliner Park Ward.

One orthodoxy to emerge in the twentieth century was the famous Rolls-Royce radiator grille owed as much to Classical architecture as to being something there to prevent stones damaging the fragile core behind; if Rolls-Royce was going to be influenced by anyone, it’d be the architects of Antiquity.  According to chapter 4 of The Lexicon of Rolls‑Royce (the company doesn’t have web pages, it has chapters), what it styles as the “Pantheon Grille” was “…inspired by Rome’s imposing Pantheon temple, the Rolls-Royce grille is iconic. The Pantheon’s majestic columns were purposefully built with wider middle sections so that the human eye perceives each long pillar to be completely straight. It’s a perfect optical illusion and a genius stroke of design.  Taking inspiration from this, the Rolls-Royce grille is tactfully arranged using wider columns at the edge and thinner columns towards the middle to create an aesthetic illusion of symmetry when admired from the front. It’s a design that appears more perfect than nature intended.”  The days are gone when Rolls-Royce’s documents were characterized by understatement (it once described its engines’ power outputs as “adequate”), the vulgar numbers revealed only when German regulators humorlessly insisted.

While Professor Goriely’s computer models could find no evidence of the effect, a century-odd earlier, Rolls-Royce’s designers were convinced by the optical tricks of the Greeks and in 1925 integrated one of their optical techniques their new grille.  Although the “squared-off” shell dates from shortly after the company’s formation in 1904, not until 1928 did the now familiar grille with its upright bars become standardized.  Prior to 1925, the radiators were fronted by horizontal “slats” best thought of as “louvers” in that they functioned like “venetian blinds” (controlled by a lever next to the driver) to enable the airflow to be controlled (thus regulating engine temperature).  By the time of the release of the model Twenty in 1928, improvements in thermal-management technology meant the slats were no longer needed so the designers could start with a “clean sheet” and, being Rolls-Royce, the went neo-classical and built their own Pantheon, refining the ideas first seem in 1925 on the “New Phantom” (known retrospectively as the “Phantom I” (1925-1931) after new generations of the model followed).  So, although Professor Goriely’s math couldn’t detect any evidence entasis produced a detectable effect for those looking at the Parthenon, what Rolls-Royce does has been modelled and although slight, the effect of their trick is real.

Lindsay Lohan in Rolls-Royce Phantom Drophead Coupé (2007-2017).  By the 1970s factory (mostly) had ceased to use the historic terms FHC (Fixed-Head coupé) and DHC (Drop-Head Coupé (DHC) and the revival in 2007 for the Phantom Drophead Coupé has proved (thus far) a nostalgic one-off.  Over the decades, the designers generally were successful in their adaptations as they were required to make the grille wider and lower but the Phantom would have benefited aesthetically if a more traditional approach had been taken with the headlamps (centre) and even hidden units (right) would have been more pleasing.  Still, twenty-first century customers seem more accommodating of stylistic innovation than earlier generations.

According to opticians, what the design does (wider bars at the edges, more slender towards the centre) is create the illusion of symmetry when viewed straight on (at even a slight angle there will be no effect).  That’s said to be because when viewing such a structure, the brain processes the image as a whole (not a sequence of individual bars) and, paradoxically, what the slight difference in width does is render an “artificial equalization”.   Because of the way the brain processes the sight of a series of “parallel bars”, were they equally-spaced and equally wide, there would be a “hollowing” effect with a “pinching” towards the centre, caused by the natural human tendency to perceive outer edges as tapering away.  The eye is an outgrowth of the brain and it’s the brain doing the processing; while “looking at a grill” might sound a simple task, in the Rolls-Royce grille there’s a lot of “information” and processing it all is an act of high-level cognition.

Hi-rise Pantheon: 1965 Rolls-Royce Phantom V.  This was about at tall as the grille got; it appeared on the Phantom V (1959-1968) & VI (1968-1990).

All else being equal, the brain tends first to focus on an image’s centre (that information sent to the fovea centralis (the part of the retina handling “sharp central vision”)) with the edges simultaneously entering the “peripheral vision” where spatial resolution decreases (the brain therefore gathering less precise detail about the outer dimensions).  All this happens in a fraction of a second but does still happen sequentially, the brain using “predictive modelling” to “fill in the blanks” and there is much to process, the grille a large, highly reflective three-dimensional object with repeating lines.  The brain’s visual cortex has much to do understand the contrasting light patterns and depth cues and that it does all this in a fraction of a second in an indication of how powerful a machine it is.  Additionally, Rolls-Royce further assists the brain in “manufacturing perfection by machining each bar with a very slight outward curve, not detectable to the naked eye.  The combination of this functionally imperceptible “width-shifting & curvature” uses the way the brain operates to induce the required corrective “shortcuts”.

The Pantheon Temple, Rome (left) and 1985 Rolls-Royce Camargue (right).

The Pantheon's Latin inscription M·AGRIPPA·L·F·COS·TERTIVM·FECIT isn't all that poetic and reads like a note the draftsman might have put on the blueprint (had there then been blueprints): it translates as "Marcus Agrippa, son of Lucius, made [this building] when consul for the third time.", crediting the Roman statesman & general, Marcus Vipsanius Agrippa (circa 63 BC–12 BC) who commissioned the construction during his third consulship in 27 BC.  The Pantheon that stands today was rebuilt by Emperor Hadrian (Publius Aelius Hadrianus, 76–138; Roman emperor 117-138) circa 126 AD after the original structure suffered severe damage in a blaze; Hadrian chose to retain Agrippa's inscription as a tribute (not all the emperors were narcissists).  Since 609 AD, the Pantheon has been a Roman-Catholic church and is known as the Basilica Santa Maria ad Martyres (Basilica of St. Mary and the Martyrs).   In 1975, when the Camargue (1975-1986) was released, the novelty of it being the first Rolls-Royce designed using exclusively metric measurements (except for the odd carry-over component) attracted little attention but there was much comment about it being the first built with anything but a perfectly vertical grille.  The Camargue's grille was slanted at a (for mid-century Rolls-Royce) rakish 7^o.

Waftability

Parthenon Grill, Murfreesboro, Tennessee.

Understandably, the malapropism “Parthenon grill” is sometimes heard (and there is a well-reviewed Greek restaurant in Murfreesboro, Tennessee of that name) and despite occasional claims, the Pantheon grille doesn't feature a classic entasis (slight swelling in the middle of a column to counteract the alleged illusion of concavity) but the slight curve of the bars is real and can be checked with equipment no more complex than a “straight-edge” (a 12 inch (300 mm)) metal ruler ideal for the purpose.  Although for much of the twentieth century Rolls-Royce was much associated with straight lines (the “knife-edge” models bodied by coach-builder Hooper between 1935-1959 the high point of the brief era of  blending of a severe rectilinearly with the flowing lines of the pre-war aesthetic although, despite the mix, the approach was not within the lineage of post-modernism) curves have often been a component and in 2009 Tom Purves (b 1949; CEO of Rolls-Royce Motor Cars 2008-2010) announced the neologism “waftability” was “the essence of the brand”.  That, he defined as “calm perfect motion and accelerating quickly without fuss”.  Back then (and 2009 seems now little less remote than the days of the Cold War (1947-1991)), the CEO was describing the relationship between the appearance of a static Rolls-Royce as something that embodied that definition, revealing the internal name for the “gentle, upswept line of the sill” on the new Ghost model was a “waftline” (actually borrowed from the fashion business), the idea being it created “a powerful, poised stance and makes the car appear to be moving when stationary.”

1988 Rolls-Royce Corniche Convertible.  Although rendered redundant by electric motors, the Pantheon Grille will endure; it will be wider and lower (as has already happened) and some functional use may even be found but as an essential element in “brand identity” it won't go away.

The significance of “waftability” was Rolls-Royce was then still in the business of making large-displacement engines running on fossil fuels sound and behave as if they were electric motors but, by 2023, the company announced the Spectre, the brand’s first purely electric car.  So it had taken a while but the interest in electric energy predated even the formation of the company in 1904.  Sir Henry Royce (1863–1933) was an engineer who had designed dynamos, electric crane motors and patented the bayonet-style light bulb fitting while Charles Rolls (1877–1910) as early as 1900 drove an electric car declaring it the almost ideal form of propulsion, observing: “The electric car is perfectly noiseless and clean. There is no smell or vibration, and they should become very useful when fixed charging stations can be arranged.  But for now, I do not anticipate that they will be very serviceable – at least for many years to come.”  So it proved.  By 2023 however, the technology was ready and so (more debatably) was the infrastructure and there is nothing better at waftability than something large, luxurious and electric, Rolls-Royce saying that some time in the next decade, their last car running on fossil fuel will leave the assembly line.  Nothing lasts forever and, having spent more than a century trying to make ICEs (internal combustion engine) as smooth and silent as electric motors, the times seem now to suit Rolls-Royce.  For others (such as Ferrari, Porsche, Dodge etc), selling to a customer base with an emotional attachment to the howl, throb & scream of gasoline (petrol) exploding in six, eight or twelve combustion chambers, the challenge is to find a way to make them content with a piped soundtrack.  Engineers have conquered matters of performance and even range but nostalgia may prove harder to package.  For Rolls-Royce however, the task is simpler because it’s purely visual: While an electric car needs no radiator and thus no protective grill, it can be guaranteed Pantheon Grilles, severely cut in stainless steel, will continue to appear.

Iconoclast

Iconoclast (pronounced ahy-kon-uh-klast)

(1) A person who attacks cherished beliefs, traditional institutions etc as being based on error or superstition.

(2) A breaker or destroyer of images, especially those set up for religious veneration.

(3) An adherent of the heretical movement within the Greek Orthodox Church from 725-842 AD, the ethos of which was the destruction of icons and religious images (late applied to the Puritans who pursued the same goal during the European Reformation).

1590–1600: From the Middle English, from the French iconoclaste from the Medieval Latin īconoclastēs from the Byzantine Greek εἰκονοκλάστης (eikonoklástēs) (literally image-breaker), the construct being eikono- (genitive eikonos) (icono-) + -klastēs (breaker), equivalent to klas-, variant stem of klân (to break) + -tēs (the agent noun suffix).  The early meaning referred to those who, in acts of theological obedience, literally physically broke or destroyed objects judged "idols"; the figurative meaning in reference to beliefs, cherished institutions etc emerged later, sources variously citing the first use between 1842-1858.  An older word for it was iconomachy (1580s), from the Greek eikonomakhia.  In geology, "clast" is technical term describing a fragment of rock broken from a larger rock or rock unit.  In a religious context, although not exact synonyms, the words often seen when discussing "iconoclast" include: "unbeliever", "revisionist", questioner", "dissenter", "heretic", "radical", "dissident", "non-believer", "critic", "rebel", "revolutionist", "cynic", "sceptic", "ruiner", "revisionist"  & "non-conformist".

In secular use, it’s different.  The targets of the self-appointed iconoclast Christopher Hitchens (1949-2011) included Dr Henry Kissinger (1923-2023; US national security advisor 1969-1975 & secretary of state 1973-1977), the Albanian-Indian Catholic nun Saint Saint Mother Teresa of Calcutta (Anjezë Gonxhe Bojaxhiu; 1910–1997; founder of the Missionaries of Charity (1950)) and God, his intellectual method being: “What can be asserted without evidence can also be dismissed without evidence.”, now a rule in philosophical debate in the tradition of Bertrand Russell’s (1872–1970) teapot and known as Hitchens’ Razor.  That was based on the model of Occam's razor, a reductionist technique in problem-solving (known also as lex parsimoniae (Latin for “law of parsimony”, the idea being explanations are best found by reducing problems to the smallest number of elements)), attributed to English Franciscan friar, scholastic philosopher and theologian William of Ockham (or Occam, circa 1287-1347).  One suffering iconophobia (an aversion to icons) is said to be iconophobic but this is a condition in metal health (one of many phobias not listed in the APA's (American Psychiatric Association) DSM (Diagnostic and Statistical Manual of Mental Disorders) not necessarily related to any theological or doctrinal object to icons although there's no reason why the conditions can't run in parallel.  Those whose objection to icons is based on religious teachings maintain a position of iconomachy (hostility to images as objects of worship) and may be classed as iconomachs.  Iconoclast, iconoclasm & iconoclasticism are nouns, iconoclastic is a noun & adjective and iconoclastically is an adverb; the noun plural is iconoclasts.

The Byzantine Iconoclastic Controversy

The Iconoclastic Controversy, an eighth & ninth century dispute over the use of religious images in the Byzantine Empire, was one of the many squabbles in Christendom (and other religions) triggered by arguments between those reading ancient texts literally and those treating them as allegory.  Thanks mostly to the efforts of medieval (and later) writers further to the west, much of what grew from the city of Byzantium was a reputation for rules of needless complexity, bureaucracy and seriously weird theology but more recent scholarship of the empire's history of over a millennium has been more positive and there’s now a recognition that in the history of Western civilization, something remarkable happened on the Bosphorus.  The place did though have its moments and the iconoclasts objected to icon veneration, essentially because of the Old Testament's prohibition of images in the Ten Commandments and the possibility of idolatry.

Byzantine icons.

4 Thou shalt not make unto thee any graven image, or any likeness of any thing that is in heaven above, or that is in the earth beneath, or that is in the water under the earth.

5 Thou shalt not bow down thyself to them, nor serve them: for I the Lord thy God am a jealous God, visiting the iniquity of the fathers upon the children unto the third and fourth generation of them that hate me;

6 And shewing mercy unto thousands of them that love me, and keep my commandments. (Exodus 20:4 (King James Version of the Bible (KJV, 1611))

The defenders of the importance of imagery insisted on their symbolic nature and the dignity of created matter and nor was the controversy in Constantinople anything new.  From the Church’s earliest days, the making and veneration of portraits of Christ and the saints had been opposed by many but the use of icons nevertheless steadily gained in popularity, especially in the eastern provinces of the Roman Empire.  By the late sixth century, icons had become the object of an officially encouraged cult, sometimes implying a superstitious belief in their animation and the opposition to these practices became especially strong in Asia Minor (the modern-day Republic of Türkiye (Turkey)).  In 726, the Byzantine emperor Leo III (circa 685–741) took a public stand against the perceived worship of icons, and in 730 proscribed their use, trigging a persecution of icon venerators that was most severe in the reign of Leo’s successor (Constantine V (741–775)).  While the emperor’s scholars expressed the theological edict in elegant Byzantine script, on the ground, the smashing of icons and the attacks on the idolaters was done by angry mobs, assembled for the purpose by the social media of the day, events reprised in the sixteen and seventeenth centuries by Protestants in the Netherlands who vandalized former Roman Catholic churches in a second (and most enthusiastic) burst of iconoclasm.

Icon of the Empress Theodora, from a sixth century wall mosaic, Church of San Vitale, Ravenna, Italy.

Over the decades, in Byzantine fashion, power shifted between the factions.  In 787, the Empress Irene (circa 752–803) convoked the seventh ecumenical council at Nicaea at which Iconoclasm was condemned and the use of images was again permitted.  The Iconoclasts regained power in 814 after the accession of Leo V (circa 755-820) meaning icons returned to the banned list after a ruling at a council in 815, the prohibition lasting until the death of the Emperor Theophilus (Circa 800-842).  Within a year of his death, his widow, the Empress Theodora (circa 815–circa 870s), finally restored icon veneration, an event still celebrated in the Eastern Orthodox Church as the Feast of Orthodoxy although, in a piece of theological sophistry that would have impressed any pope, or those writing the tortured communiqués emerging from Lambeth Conferences, Theodora explained she was permitting only veneration (not worship) and in that state, the Eastern Orthodox view of icons has rested for more than a thousand years.

Neville Chamberlain in “uniform” (bowler hat, winged collar, watch fob & chain and rolled umbrella), 10 Downing Street, July 1937.

Presumably it was for veneration rather than worship one Greek Orthodox church in October 1938 wrote to 10 Downing Street asking for one of Neville Chamberlain's (1869–1940; prime minister of the UK 1937-1940) umbrellas so it could be made into an icon.  Cheered in the House of Commons and for a while the most popular man in Europe after negotiating in Munich "peace in our time", Chamberlain's earnest, sincere hopes for peace were soon dashed.  Chamberlain had often been photographed carrying his rolled black umbrella; it was part of an English gentleman’s “uniform” but when the moral and political bankruptcy of the Munich Agreement was exposed, rapidly his umbrella was transformed from an icon of civilized diplomacy into an emblem of a naïve and ineffectual amateur unsuited to a dangerous new world.  He was the “prime suspect” among 15 and named as “Umbrella Man” in the 1940 pamphlet Guilty Men (an excoriation of the well-intentioned (and highly popular) but failed policy of appeasement) by Cato (the pseudonym of three politically-aligned journalists (Frank Owen (1905-1979, Liberal), Michael Foot (1913-2010, Labour) and Peter Howard (1908-1965, Conservative).  It's not known if the priest ever got his umbrella.  

Screen icons: A MS-Windows 11 system running Windows 10 GUI emulation.

Although, reflecting the state of electronics at the time, the early implementations were chunky and the color range was limited, screen icons first appeared in computer GUIs (graphical user interfaces) in 1973 on the experimental Xerox Alto computer developed at Xerox's PARC (Palo Alto Research Center, later re-branded as the Future Concepts division).  The Xerox Star (1981) is believed to be the first commercially available system (technically a workstation) with a GUI including many now familiar screen icons (folders, trash can etc) although it wasn't until 1975 Xerox began using "icon" to name the shapes.  As many analysts have pondered, such was Xerox's jump-start in what evolved into personal computing that had things been handled differently, it might have been Xerox rather than IBM, Microsoft and Apple which came to dominate the field; within the industry, it’s acknowledged both Apple and Microsoft drew on the pioneering work by Xerox when developing their own GUIs.  Apple’s Lisa (1983-1986) from the start used an icon-rich GUI and although a landmark technical achievement, it was too expensive ever to succeed in the consumer market and in corporate use it was only ever a niche device.

Screen icon: Icon is now one of popular culture's more overused words, but, in fairness, there's been a bit of meaning-shift and re-purposing since the iconoclasts rampaged through Constantinople's churches, all those years ago.

It was the less ambitious Apple Macintosh (1984) that (at around a quarter the Lisa’s price) first popularized the GUI although in the 1980s, such was the influence of IBM (International Business Machines) that although the original IBM PC (1981) and its immediate successors were in many aspects less capable than the Macintosh, those modest machines achieved a much higher level of corporate penetration that Apple in the pre-mobile era managed.  Microsoft though could see the writing on the wall and as early as 1983, the first release of Windows (a GUI operating environment that ran “on top” of the PC & MS-DOS operating systems) included screen icons although, because of limitations in cost-competitive hardware, the implementation was partial with file-loading happening through text-lists while the icons appeared at the base on the screen only when running programs that had been minimized.  Not until Microsoft Windows 3.0 (1990) did the icons appear as central elements and mainstream corporate acceptance came with the release of Windows NT 4.0 (1996) and Windows 98 (1998), both with the object-oriented GUI still used by current versions of Windows.  In the early 1980s, command line junkies of course viewed icons as effete things needed only by “girly men unable to memorize arcane text strings” but, after a while, even those curmudgeons found themselves mousing their way around and clicking rather than typing; they didn’t long remain iconoclasts and many now would deny they ever were.

Mushroom

Mushroom (pronounced muhsh-room)

(1) Any of various fleshy fungi including the toadstools, puffballs, coral fungi, morels etc; any of several edible species, especially of the family Agaricaceae, as Agaricus campestris meadow mushroom, or field mushroom, cultivated for food in many places.

(2) A fungus producing such fruiting bodies.

(3) Anything of similar shape or correspondingly rapid growth.

(4) As ellipsis of “mushroom cloud”, a large, mushroom-shaped cloud of smoke or rubble, formed in the atmosphere as a result of an explosion (or other sudden release of energy), especially a nuclear explosion.

(5) Of, consisting of, or containing mushrooms.

(6) Resembling a mushroom in shape or form; to have or assume the shape of a mushroom.

(7) Of rapid growth and often brief duration (to spread, grow, or develop quickly).

(8) To gather mushrooms (typically as “mushrooming”, practiced by a mushroomer).

(9) As “magic mushroom” (used typically in the plural), any mushroomlike fungus that after ingestion induces psychedelic effects (“shrooms” to users, “psilocybin mushroom” to clinicians in some jurisdictions where prescription is now lawful).

(10) In ballistics (of a bullet), to form the shape of a mushroom when striking a soft target.

(11) In bar billiards, any of the mushroom-shaped pegs.

(12) In architecture, a concrete column with a thickened portion at the top, used to support a slab.

(13) In slang, an individual who rises rapidly from obscurity or poverty (now rare and displaced by “upstart”); the figurative sense of something that grows very quickly or seems to appear suddenly remains in use.

1350–1400: Following the usual conventions in English, it may be expected the construct was mush- + -room but those words wholly are unrelated and the ultimate source is unknown.  Mushroom was an alteration (by folk etymology) of the Middle English muscheron & musseroun, from the eleventh century Middle French mousseron, from the Anglo-Norman musherum & moscheron, from the Old French moisseron, from the Late Latin mussiriōn- (stem of mussiriō).  The Old French word had a murky history and etymologists suspect it was from the Old French mosse & moise (moss (from which modern French gained mousse (on the basis of the first known use being of a type of fungus which grows in moss))), from the Frankish mosu (moss) or the Old Dutch mosa (moss).  The Old French was akin to the Old High German mosa (moor, swamp), the Old High German mos (moss, bog) & mios (moss, mire), the Old English mēos (moss) & mōs (bog, marsh), the Old Norse mosi (moss) & myrr (bog, mire), all from the Proto-Germanic musą, muso & miuziz (mosses, bog), from the primitive Indo- European mews- (mosses, mold, mildew).  It displaced the native Old English swamm.  The clipping shroom is a synonym (most popular with users of magic mushrooms) and the spelling mushrump is long obsolete (the modern spelling more or less standardized by the 1560s).  Mushroom is a noun, adjective & verb, mushroomed is a verb, mushrooming is a noun & verb, mushroomer is a noun, mushroomic, mushroomless, mushroomlike, mushroomoid & mushroomy are adjectives; the noun plural is mushrooms.

Lindsay Lohan's mushroom gravy.

Ingredients

3 tablespoons olive oil or butter
3 cups thinly sliced baby portabella mushrooms or white button mushrooms
½ cup finely chopped onion
1-2 cloves garlic, minced
3 tablespoons all-purpose flour or cup for cup gluten-free flour
3 cups beef broth/stock or vegetable stock
Salt and pepper to taste

Instructions

(1) In a large skillet, heat oil over medium-high heat.  Sautee mushrooms and onions until they are nicely browned (should take around 7 minutes).  Add in garlic and stir until fragrant (about 30 seconds).

(2) Stir in the flour and cook for 1 minute.  Whisk in the broth, remembering to scrape from the bottom of pan all the "browned bits" (the best part).  Reduce to a simmer and simmer until thickened, then remove from heat.  Taste for salt and pepper and season to taste.

The alternative etymology (noting the Ancient Greek μύκης (múkēs) (mushroom) suggests the Old French may be of pre-Roman origin and it remains a matter of debate among etymologists (almost all lexicographers stick to “of uncertain origin”).  What is agreed is the noun “mushroom” was at first applied to almost any of the larger fungi but later to the agaricoid fungi (especially the edible varieties).  The figurative use for something or someone that makes a sudden appearance in full form dates from the 1590s; it was applied especially an upstart person (bounder) or family (those who rose rapidly from a low station in life).  All that was based on the mushroom’s impressively rapid rate of growth and by the 1740s the figurative use substantially has lost the “upstart” sense and came to be used generally of “expanding or increasing rapidly; to rise suddenly in position or rank”.  The famous (or infamous) “mushroom cloud” was first widely described in 1916 (World War I (1914-1918) a time & place of big explosions witnessed by many with cameras) but the OED (Oxford English Dictionary) cites the first use as dating from US in 1902.  It thus long pre-dates the nuclear-age but the phenomenon would for millennia (long before there were explosives) have been observed by those watching volcanic eruptions.  After photographs of the immediate aftermath of the A-bombing of Hiroshima & Nagasaki (August 1945) widely were publicized, the term became popular and spread to many aspects of popular culture including film, art and T-shirts.

Germania, Berlin’s sandy soil and the “mushroom” used to test for sinkage

Germania model, circa 1940.  The scale of the buildings was monumental and Speer was aware of the comparisons with the Rome and Athens of Antiquity, even writing (a not wholly original) “Theory of Ruin Value” arguing the importance of designs that might, thousands of years hence, leave “magnificent ruins”.

Until in the twenty-first century the CCP (Chinese Communist Party) began doing things at a scale once thought unsustainable, the urban-redevelopment plan imagined on a grandest scale was that for Berlin designed by Albert Speer (1905–1981; Nazi court architect 1934-1942; Nazi minister of armaments and war production 1942-1945).  What was the be the capital of the Third Reich (and, in the minds of the most delusional of the Nazis: “of the world”) would be renamed Germania and, as Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945) told Speer’s wife: “Your husband is going to build buildings for me the likes of which haven't been built for 4,000 years.”  Prone to lies and exaggeration, this was one of the occasions the Führer was being truthful and although there was little the plans for Germania that was original, what was impressive was the scale, Speer taking reference points from architectural history (the Pantheon in Rome, the Arc de Triomphe in Paris) and making the German versions bigger.  Although at the time much taken with what he called the regime’s “Empire style”, in his (sometimes reliable) post-war memoirs (Erinnerungen (Memories or Reminiscences) and published in English as Inside the Third Reich (1969)) he admitted the stylistic failure, above all because the architecture wholly was disconnected from the human scale.

The mushroom, Speer's improbable architectural legacy.

Of all that Speer planned for Hitler's megalomaniacal vision of Germania, only small fragments remain but the strangest and largest relic is the Schwerbelastungskörper (heavy load-bearing body) a concrete structure 30 metres (100 feet) tall and weighing 12,650 tons (11,476 tonnes); locals nicknamed it der Pilz (the mushroom).  Located on the city’s southern edge (near modern day Südkreuz station), the giant concrete cylinder was in 1941 erected to test the suitability of Berlin’s sandy soil, something of great significance because most of Germania’s large, representational buildings would be constructed from granite, concrete & steel; although structural engineers could solve the challenges the architects designs presented, the only way to be certain the soil could handle such weight was to conduct a practical, real-time, full-size experiment.  While the data were required for much of what was planned, of particular interest was intended landmark of the Victory Arch which, at 117 metres (384 feet) tall and 170 metres (558 feet) wide would obviously exert much pressure and, having the foundations sinking into the sandy soil was less than ideal.  With a footprint of exactly 100 m³, Speer’s giant, reinforced concrete “mushroom” was placed in a way that would as closely as possible emulate the forces involved; it sat 18 metres (60 feet) deep with the above-ground extending 14 metres (46 feet) high while inside there were a number of measuring devices recording movement.  As things transpired the instruments recorded sinking between 110-180 mm (4.3-7.1 inches) across the six measuring points and that was well beyond the 60 mm (2.4 inches) deemed by Speer as the upper limit of acceptability.  Whether the findings would have compelled a change to the arch or indeed any of Germania’s other gargantuan designs will never be known because, as the tide of war turned, the resources devoted to the project were re-allocated to more urgent tasks and by 1943 Speer, by then also minister of armaments and war production, quietly shut-down the Germania planning office.  So little was built and less survived but the “mushroom” remained and is now a tourist attraction and a site visited by many organized tours.

The mushroom cloud

Tsar Bomba, the largest ever nuclear test, detonated by the Soviet Union in October 1961.

As the photographs suggest, the mushroom clouds generated by large volcanic eruptions and the detonation of nuclear weapons can look similar because the same atmospheric physics are operating despite the underlying energy-release mechanisms being completely different and, counterintuitively, there is no precise TNT (abbreviation of trinitrotoluene (an explosive substance used in blasting)) equivalent threshold above which every explosion produces a mushroom cloud. A mushroom cloud is principally a consequence of buoyancy and atmospheric fluid dynamics, rather than merely a product of energy released, thus the phenomenon can occur with nuclear explosions, large conventional explosions, volcanic eruptions and even especially intense fires.  What an explosion does is produce a very hot, rapidly expanding mass of gas and entrained material and this rises because the air above has less resistance than the ground below; it rises because it has acquired enormous upward momentum and, as it rises, it entrains surrounding air.  The most important mechanism in the ultimate generation of a mushroom cloud’s distinctive shape is a phenomenon plasma physicists call “thermal buoyancy”.

Physics of a mushroom cloud (left), the fluid dynamics an interplay of energy, matter & air temperature and a mushroom cloud T-shirt (right), the images used sometimes for political messaging and sometimes just for dramatic effect. 

Fernando Famiani's photograph of the eruption of Mt Etna, Sicily, Italy, December 2015, shot from the outskirts of the village of San Teodora.

Familiar from many conditions in climate science, as hot material rises, the heated gas being less dense than the surrounding atmosphere, the rising plume entrains cooler air, increasing its volume while reducing its average temperature, a process that continues until its density approaches that of the surrounding atmosphere at which point, the rising material spreads laterally, producing the mushroom cloud’s characteristic “cap”, the outer regions circulating downwards, maintain the shape of the stem.  There are scaling relationships between explosion energy and the size, height and evolution of the resulting plume and consequently, as a general principle, as explosions become larger, a mushroom cloud becomes increasingly likely under appropriate atmospheric conditions.  So the mushroom cloud is a product of the environment; the same release of energy in different conditions (an explosion deep underground; a large underwater explosion; an explosion in a confined structure; energy released over a sufficiently long period rather than instantaneously) will tend not to create one whereas a relatively modest release of energy can produce one if the geometry and atmospheric conditions are favourable.  So, a mushroom cloud is a thing not of yield but of atmospheric conditions.

Death cap mushrooms.

In 2023, Australian mother of two Erin Patterson (b 1974) murdered three of her relatives and nearly killed a fourth by preparing for them a lunch of Beef Wellingtons laced with highly toxic death cap mushrooms.  Amanita phalloides (the more evocative “death cap” the common name) is a basidiomycete fungus and mushroom (one of many in the genus Amanita) and although originally from Europe, it has spread around the planet as have many species (zoological & botanical) in the age of mass-movement of people and goods.  Dangerously, the death cap closely resembles a number of (variously bland and delicious) edible mushrooms used in many dishes so mushroomers must take care when mushrooming (harvesting wild mushrooms).  They’re the most poisonous of all known mushrooms and a single example contains enough toxin to kill an adult human; unsurprisingly, death caps are estimated to be responsible for as many as 90% of the annual death-toll from eating toxic mushrooms.  Quite what is the extent of the annual loss of life is uncertain because in rural parts of Asia (where foraged mushrooms are common in diets) the statistics are not reliable but it’s believed the numbers bounce-around between 100-300.  The principal toxic constituent (hardly affected by cooking or freezing) is α-Amanitin which causes liver and kidney failure.

Erin Patterson, prior to charges being laid.

It was severe liver failure that was the cause of the death of Erin Patterson’s three victims, all of whom died within a week of falling ill (despite one receiving a liver transplant); the sole survivor recovered after several weeks of treatment.  The trial was conducted before a jury that delivered a guilty verdict on all three charges and the judge handed down a sentence of life imprisonment with a non-parole period of 33 years; there was immense international interest in the case and it was the first sentencing hearing in the state of Victoria to be live-streamed.  In what was anyway a macabre tale, one interesting aspect was the way Erin Patterson chose to learn about the nature of the death cap; some will have drawn the conclusion: “When researching murder-methods, don’t use one’s own digital devices.”  The case currently is on appeal, the defense seeking a retrial on several procedural and technical grounds while the state is arguing the sentence was “manifestly inadequate” and there should be no possibility of parole.  On X (formerly known as Twitter), some were even more unforgiving, suggesting: “She should get the chair.”

Cryptic crochet: Erin Patterson crocheted a rat as a gift for her defense counsel.  According to press reports, it was an expression of “thanks” but a crocheted mushroom would have been a nice touch.

In her cell, “mushroom lady” (the public's choice of dub upon the case being publicized) is said to pass the hours crocheting, an intricate, time-consuming business but for those serving long prison sentences, time is relative in a way different to that made famous by Albert Einstein (1879-1955) and for the seven Nazis incarcerated in Spandau prison after the first Nuremberg Trial (1945-1946), “time” often came up in their sometimes awkward conversations.  Grand Admiral Erich Raeder (1876–1960; head of the German Navy 1928-1943) served as prison librarian and, responding to a complaint from one of his fellow inmates that his handing out the four permitted (and by 1954 uncensored) newspapers (one selected by each of the powers administering the prison (France (Kurier), the UK (Frankfurter Allgemeine Zeitung), US (Die Welt) & USSR (Berliner Zeitung)) bound in one folder meant “It will take too long for one person to read all four newspapers”, answered “That doesn't matter. You've got plenty of time, after all.”  Despite that uncompromising start, within two days the admiral relented, averting the threat of mutiny by distributing the papers singularly.

According to Australian neuroscientist Dr Sarah McKay, knitting and crochet can be “deceptively good” for the brain, being an “ideal mix of repetition plus cognitive challenge”, helping individuals regulate their mood and attention span.  She explained the mechanism by pointing out in crocheting: “You have to remember where you're up to, you have to problem solve, you have to make decisions, you're constantly challenging yourself if you're doing more and more complicated patterns but, at the same time, it's challenging but it's low stakes… which I think might be one of the best kinds [of cognitive challenge] we can have.  We're mastering a skill, we're getting better at that and we're kind of just doing the task for the sake of doing the task … it's quite a simple form of mastery and there's something really soothing and good for our mood about that.”  Intriguingly, Dr McKay now has one potential subject available for what would be a unique, longitudinal study: mushroom lady sitting for 33 years in solitary confinement, crocheting stuff.  Such parameters would of course never be approved by any university ethics committee so for researchers interested how such things affect a brain operating in a most unusual environment, there are possibilities. 

Ozempic: The famous “fat jab”.  Now on GLP-1 fat jabs, hopefully the prison authorities will permit mushroom lady (once slender) to create content and open an OnlyFans page with proceeds going to the families of her victims.  There would be a viewership for such content, some of whom would seek contact.

One unexpected coda to the trial was the announcement mushroom lady has been granted access to taxpayer-funded Ozempic (a GLP-1 (glucagon-like peptide-1) appetite suppressant), the official explanation being her inability to pursue an exercise regime while in solitary confinement; because of the nature of her offences, it's expected she'll remain in solitary confinement for the foreseeable future (33 years presumably within the vista of “foreseeable”).  Unfortunately, her previous exercise techniques were not disclosed, something that would have been of interest to many pursuing weight-loss.  Doubtlessly anticipating some public outrage at the thought taxpayers would be footing the bill for mushroom lady to get free “fat jabs”, a spokesperson for Victoria’s Department of Justice issued a statement confirming weight loss drugs were just another medicine and would be provided to prisoners based on a clinician's advice: “Prescriptions are only given by clinicians when there’s a clear medical need - like preventing serious conditions such as type 2 diabetes.  Access to prescribed weight loss medication was introduced in response to recommendations from the Coroner following a death in custody linked to obesity.”  The convicted mass-murderer had told the court she “had a problem” with body image and binge-eating, a perhaps unnecessary confirmation given some of the photographs circulated by the media.