Cameo

Cameo (pronounced kam-ee-oh)

(1) A technique of engraving upon a gem or other stone, as onyx, in such a way that an underlying stone of one color is exposed as a background for a low-relief design of another color.

(2) A gem or other stone so engraved; a medallion, as on a brooch or ring, with a profile head carved in relief

(3) A literary sketch, small dramatic scene, or the like, that effectively presents or depicts its subject.

(4) As "cameo, "cameo role" or "cameo appearance", a minor part played by a prominent performer in a single scene of a production, originally un-credited yet deliberately obvious (a la Alfred Hitchcock (1899–1980)).  In modern use, the sense has extended to any brief appearance, credited or not.

(5) In commercial use, a color of creamy neutral ivory, the name an allusion to the hue most associated with the jewelry.

(6) The industry slang for "cameo lighting", a technique used on stage or set usually by restricting the output of a spotlight to a narrower beam and the reverse effect of "silhouette lighting" (a complementary chiaroscuro technique).  

1375–1425: From the Italian cam(m)eo from the Old French camaieu, of uncertain origin; replacing late Middle English camew & cameu both direct borrowings from the Old French.  The ultimate root is held usually to be the Medieval Latin cammaeus (later camaeus), of unknown origin but both the Arabic qamaa'il (flower buds) and the Persian chumahan (agate) have been suggested as the source.  Cameo is a noun & verb and cameoed & cameoing are verbs; the noun plural is cameos or cameoes.

In the early fifteenth century, kaadmaheu, camew, chamehieux and many other spellings, all from the early thirteenth century in Anglo-Latin circulated, all meaning "engraving in relief upon a precious stone with two layers of colors" (such as onyx, agate, or shell and done so as to utilize the effect of the colors).  These fell soon from use as the words derived from the Medieval Latin cammaeus and the Old French camaieu prevailed.  By the nineteenth century, use extended to other raised, carved work on a miniature scale.  The transferred sense of "small character or part that stands out from other minor parts" in a plays etc is from 1928, a derivation from the earlier meaning "short literary sketch or portrait", first noted in 1851, a transferred sense from cameo silhouettes.  A cameotype was a small, vignette daguerreotype mounted in a jeweled setting, the first examples of which were produced in 1864.

Cameo & Silhouette

A classic, simple silhouette (left), a nineteenth century hardstone cameo in 18 karat yellow gold in the mid-nineteenth century Etruscan Revival style (centre) and a  silhouette with the detailing which became popular in the late 1700s (right).

As artistic representations, there's obviously some overlap between a silhouette and a cameo but they are different forms.  A silhouette is inherently a two dimensional rendering of a shape (typically a portrait but they can be of any scene or object) which classically were simple and of a solid colour (usually black) on a contrasting (usually white or cream) background.  Originally, there was no detailing of features but that soon became common.  Silhouette portraits were highly popular in the eighteenth & nineteenth centuries and the form was especially popular with untrained (indeed unskilled) amateurs because of the cheapness and simplicity of the form, a finished work requiring little more than two sheets of paper (black & white), a pair of scissors and a pot of glue.  A cameo differs in that it is three-dimensional, an embossed or raised piece, usually in relief.  The most prized antique cameos are those engraved on semi-precious gemstones, agate, forms of onyx, shells and lava but in modern use synthetic materials are not uncommon and, being small and able to be rendered in a single piece, can be 3D printed although the quality of these doesn’t (yet) match something hand-carved.

Cameo.com

Launched in March 2017, cameo.com is a US-based distribution & content-sharing website, its niche being a platform on which celebrities and others can sell personalized video messages to fans or anyone else prepared to pay, the site claiming more than thirty-thousand sources are available.  The price per clip is said to extend from US$5 to US$3000 and operates as a dynamic supply and demand curve, the price said to rise or fall in response to elasticity in demand, all determined by an AI algorithm which is predictive (able to anticipate a rise in demand and adjust prices accordingly).

For US$400 (or US$20 for a DM), one can receive a personalized video message from Lindsay Lohan.  The service limits the text to two-hundred and fifty (250) characters so economy of language is encouraged.  The client is able to request the theme and possible topics might include relationship counselling, fashion advice, career management & international relations.  In most cases, it seems not necessary to approach this with undue urgency, many of the celebrities available on Cameo.com "for a limited time!" have been listed for some years.

Lindsay Lohan at the Mean Girls (2024) premiere, New York, January 2024.

Lindsay Lohan’s cameo in the 2024 (musical) re-make of Mean Girls (2004) attracted comment for a number of reasons but what most impressed many was the fee, reported by entertainment industry magazine Variety as US$500,000.  While that sum is unverified, what has been confirmed is that her cameo (in the math competition scene) required four hours on set; given the simplicity of the math, Variety didn’t bother printing its calculation of the hourly rate but given the 2004 production was shot over three months for which Ms Lohan was paid a reputed US$1 million, it’s clear inflation alone doesn’t account for the differential.  Still, any commodity is worth only what a buyer is prepared to pay and it’s a specialized supply & demand curve because there’s only one Lindsay Lohan.

Lava

Lava (pronounced lah-vuh or lav-uh)

(1) The molten, fluid rock that issues from a volcano or volcanic vent (sometimes accumulating (occasionally permanently) in a volcano’s “lava lake”.

(2) The rock formed when this solidifies, occurring in many varieties differing greatly in structure and constitution.

(3) In fashion, as “lava dress” (sometimes volcano dress), a long, flowing gown, classically in orange and black fabric, styled to recall a vertiginous lava flow.

(4) A shade of red which tends to orange, recalling the color of red-hot, molten lava.

(5) As Lava Lamp, the trademarked name of a electric decorative lamp made of a transparent, (usually tapered) cylinder containing a liquid in which a colored wax (or wax-like substance) is stimulated by the heat of the light bulb to change into randomly separating, seemingly luminous shapes which constantly rise and descend.

1740–1750: From the Italian lava (molten rock issuing from a volcano), from the Neapolitan or Calabrian dialectal lava (avalanche, torrent or stream; downpour overflowing the streets).  The original use in Italian was to describe flash flood rivulets after downpours and only later to the streams of molten rock from Mount Vesuvius.  The once commonly supposed link with the Latin lavāre (to wash) (from the primitive Indo-European root leue- (to wash) was based on the idea of “a liquid flowing” but is now thought one of those creations of the medieval imagination and it’s just as unlikely there’s was any relationship with the Arabic لابة‎ (lāba) (black volcanic rock).  Lava is also wholly unrelated to larva (an early stage of growth for some insects and amphibians) which was from the Latin larva (ghost-like, masked) which may have been from the Etruscan Lār (Etruscan praenomen; titulary god) which appeared usually as Lares (guardian deities).  The alternative etymology is from the Latin labes (sliding down, falling), which influenced lābī (to slide, fall or slip) (a labina an “avalanche or landslide”).  The only adjective in modern use is lavalike (or lava-like).  The old adjectives lavatic (1805), lavic (1822) & laval (1883) all fell into disuse by the twentieth century (although their occasional revival in the technical literature would not be unsurprising) and lavaesque seems never to have been coined.  The palindromic Laval did endure in France as both a locality name and surname and is remembered because of Pierre Laval (1883–1945), Prime Minister of France 1931-1932, 1935-1936 & de facto prime minister in the Vichy Government 1942-1944.  He was executed by a French firing squad in 1945.  Lava is a noun and the obsolete lavatic, lavic & lavalike were adjectives; the noun plural is lavas.

Lindsay Lohan in Pucci triangle lava-print bikini, The Bahamas, May 2007.

The terms lava and magma (from the Ancient Greek μάγμα (mágma) (paste)) are sometimes used interchangeably but to geologists and volcanologists the distinction is that Magma is molten rock which exists beneath a planet’s surface and become lava only when it flows from a volcano or volcanic vent.  Magma thus does not always become lava, sometimes cooling and solidifying as rock beneath the surface and sometimes collecting in a magma chamber.  A magma chamber differs from a lava lake in that the pleasingly alliterative latter describes the (usually large) large pool of molten lava that forms in a volcanic crater (although volcanologists do use the term also of lava which “sticks” to a volcano’s surface and doesn’t flow further.  They also in some cases call the extrusive igneous rock formed when it hardens and cools “lava” although this is not in general use, laypeople associating both “magma” and “lava” with the material in its molten state.

Lava lake, Mount Erebus, Antarctica.  Some 60 m (200 feet) in diameter, it sits within a small pit crater within the post-caldera summit and is phonolite in composition.  It may or may not remain a permanent feature.

The rock formations created by cooled magma at Mount Erebus proved especially interesting to those researching the history of the Earth’s magnetic field.  Geophysicist Dr Catherine Constable (b 1958) was studying the data used to refine a model explaining the mechanism of the earth’s occasional magnetic field reverses (from the familiar north & south polarity to the reverse where they swap) and found lava to be a substance keeping a perfect recorder of the field.  All magmas contain enough iron-rich minerals to detect the field and these align themselves toward the field as the lava freezes. As a result, the magnetic field at that moment is recorded: set in time and set in stone.  Over geological time, quite what the frequency (or the rapidity) of the shift isn’t clear and while studies suggest historically there’s be a swap every few hundred thousand years, it’s been almost a million years since the last so while one “might” be (over)due, Dr Constable says there’s no available evidence one is in progress or even immanent.

Catriona Gray (b 1994; Miss Universe 2018) in lava dress by Filipino designer Mak Tumang which used a image of lava flowing down the portrait of the Mayon Volcano rendered, in Swarovski crystals, Bangkok’s Impact Arena, Thailand, December 2018 (left) and lava flow on Tungurahua volcano, Huambalo, Ecuador (right).

Catriona Gray on the catwalk, lava flowing.

Lava cup-cakes

Lava cakes can pay tributes to volcanologists in different ways.  They can feature a magna chamber which, upon slicing can feed a lava flow or they can formed with an exposed crater in which sits a lava lake.  Professional chefs can produce the effects with room-temperature “lava” but usually these are for display and the cakes work best with hot, melted chocolate and obsessives use a variety of ingredients (peanut butter, raspberries, orange colored icing et al) to attempt to emulate the variegated colors of the real stuff.  They work best with dark chocolate but sweeter types can be used (or a blend).  Lava cakes can be made at larger scales but the laws of physics (both thermal and structural) mean full-sized constructions can be challenging (and messy) so most produce lava cup-cakes.  Because, in a sense, lava cakes are a kind of civil engineering, some very complex recipes have been created but the following will make 6-8 cup-cakes (depending on the size of the muffin tins) and it has the virtue of simplicity:

Ingredients

4 tablespoons of unsalted butter at room temperature (plus some with which to grease the muffin tray).

A third of a cup of granulated sugar (plus some to sprinkle in the muffin tray).

3 large eggs.

A third of a cup of all-purpose flour.

A quarter teaspoon of salt.

8 ounces of dark chocolate, melted (for best results, delay the melt process until ready to blend (step (8) below).

6-8 squares (from the standard blocks) of dark chocolate.

Icing (confectioners') sugar, for dusting.

Whipped cream or ice cream, for serving (optional).

Fruit for serving (optional and most choose a red or orange variety).

Instructions

(1) Preheat oven to 400°F (205°C).

(2) Grease the cups of muffin tray with butter, ensuring the coasting is light and consistent.

(3) Sprinkle some granulated sugar over the muffin tray and ensure each has buttered cup has a consistent coating.  Shake off any excess grains.

(4) Spoon some granulated sugar into each cup, swirling to make sure the cup is completely lined.

(5) Blend the butter and granulated sugar until the mix is creamy.

(6) To this mix, as the eggs, one at a time, blending them in after each addition.

(7) To this mix, beat in flour and salt (on a low speed) until combined.

(8) To this mix, add the molten chocolate, and beat until combined.  Don’t be off-put if the mix seems either more or less viscous that you might expect.

(9) Pour mix into the greased cups. Fill only to half-way.

(10) In the centre of each cup, place one of the chocolate squares.

(11) Add the remaining mix to each cup but, because the mix will expand, don’t fill higher than three-quarters.

(12) Put tray into the heated oven, baking until the middle of the cakes no longer jiggle (should be no more than 8-12 minutes and if left too long, they’ll cease to be lava cup-cakes and become chocolate cup-cakes).  Because there’s some risk of spillage, place baking paper underneath the tray.

(13) Remove tray from oven and allow it to sit for 7-8 minutes.

(14) Up turn tray on a plate or other suitable flat surface and remove cup-cakes so the conical aspect resembles volcano.

(15) Dust with the icing (confectioner's) sugar and serve with vanilla ice cream or whipped cream, adding some sort of fruit if desired.  Upon being sliced, the magma should ooze out, lava-like.

The Lava Lamp

The decorative lava lamp was invented in 1963 by Edward Craven Walker (1918-2000), a Word War II (1939-1945) RAF pilot who was inspired by a rigged-up egg-timer he saw in a pub, the device made with oil and water in a bottle.  Oil and water being two immiscible (unable to mix) fluids, the time worked by shaking the bottle, the egg deemed to be ready when the resulting blobs of oil had re-coagulated.  Knowing the world was well-supplied with cheap, reliable egg-timers, Craven saw little point in “making a better mousetrap” but he found the behavior of the blobs a pleasing piece of art and in his garage experimented with different fluids until he found a pleasing combination which produced just the effect he’d envisaged.  The characteristic shape of the lamp came about because the one seen in the pub used a standard cocktail shaker and the container in which Craven undertook his early research was an orange-squash bottle which was made in a similar shape; it proved ideal.  They work by the heat-soak from the incandescent light-bulb heating up the blobs, lowering both their density and the liquid's surface tension.  As the warmed blobs rise, they cool, lose buoyancy thus descend to the base where a wire with an active current breaks their surface tension, inducing re-coagulation.

Although associated with psychedelia, as well as lurid colors (the range expanded since the introduction of LEDs), lava lamps with plain black blobs in clear fluid are available.

The first lava lamp patent (Lava Lamp is a registered trademark in some jurisdictions) was applied for in 1963 and they were first displayed in 1965.  Very popular in the early-mid 1970s, by the 1980s the fad had passed, not because of the popular association of them with stoners imagined sitting staring at one for hours while the Grateful Dead played on the turntable, endlessly on repeat but because they’d come to be thought of as plastic kitsch.  However, they never quite went away and while there are spikes in demand (associated usually with some appearance in some prominent piece of popular culture), there is clearly a constant demand for those who just like the look while others furnish according to retro schemes or like the odd ironic piece among their conspicuous good taste.

Kitsch

Kitsch (pronounced kich)

(1) Something though tawdry in design or appearance; an object created to appeal to popular sentiment or undiscriminating tastes, especially if cheap (and thus thought a vulgarity).

(2) Art, decorative objects and other forms of representation of dubious artistic or aesthetic value (many consider this definition too wide).

1926: From the German kitsch (literally “gaudy, trash”), from the dialectal kitschen (to coat; to smear) which in the nineteenth century was used (as a German word) in English in art criticism describe a work as “something thrown together”.  Among “progressive” critics, there was a revival in the 1930s to contrast anything thought conservative or derivative with the avant garde.  The adjective kitchy was first noted in 1965 though it may earlier have been in oral use; the noun kitchiness soon followed. Camp is sometimes used as a synonym and the two can be interchangeable but the core point of camp is that it attributes seriousness to the trivial and trivializes the serious.  Technically, the comparative is kitscher and the superlative kitschest but the more general kitschy is much more common.  The alternative spelling kitch is simply a mistake and was originally 1920s slang for “kitchen” the colloquial shortening dating from 1919.  Kitsch & kitchiness are nouns, kitschify, kitschifying & kitschified are verbs and kitschy is an adjective; the noun plural is kitsch (especially collectively) or kitsches.  Kitschesque is non-standard.

Kitsch can become ironic.  Lava lamps were in the 1970s briefly fashionable as symbols of the modern but were soon re-classified kitsch.  In the twenty-first century, such was the demand that re-creations of the originals became available, bought because they were so kitsch.

For something that lacks and exact definition, kitsch is probably surprisingly well-understood as a concept although not all would agree on what objects are kitsch and what are not.  Nor does is there always a sense about it of a self-imposed exclusionary rule; there are many who cherish objects they happily acknowledge are kitsch.  As a general principle, kitsch is used to describe art, objects or designs thought to be in poor taste or overly sentimental.  Objects condemned as kitsch are often mass-produced, clichéd, gaudy (the term “bling” might have been invented for the kitsch) or cheap imitations of something.  It can take some skill to adopt the approach but other items which can compliments such a thing include rotary dial phones and three ceramic ducks flying up the wall (although when lava lamps were in vogue, lava lamp buyers probably already thought the kitsch.

Lindsay Lohan: Prom Queen scene in Mean Girls (2004).  If rendered in precious metal and studded with diamonds a tiara is not kitsch but something which is the same design but made with anodized plastic and acrylic Rhinestones certainly is.

Führer kitsch: A painting attributed to Adolf Hitler.

The Nazi regime devoted much attention to spectacle and representational architecture and art was a particular interest of Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945).  Hitler in his early adulthood had been a working artist, earning a modest living from his brush while living in Vienna in the years before World War I (1914-1918) and his landscapes and buildings were, if lifeless and uninspired, competent enough to attract buyers.  He was rejected by the academy because he could never master a depiction of the human form, his faces especially lacking, something which has always intrigued psychoanalysts, professional and amateur.  Still, while his mind was completely closed to any art of which he didn’t approve, he was genuinely knowledgeable about many schools of art and better than many he knew what was kitsch.  However, the nature of the “Führer state” meant he had to see much of it because the personality cult built around him encouraged a deluge of Hitler themed pictures, statuettes, lampshades, bedspreads, cigarette lighters and dozens of other items.  A non-smoker, he ordered a crackdown on things like ashtrays but generally the flow of kitsch continued unabated until the demands of the wartime economy prevailed.  In the Berghof, his alpine headquarters on the Bavarian Obersalzberg near Berchtesgaden, there were constant deliveries of things likes cushions embroidered with swastikas in which would now be called designer colors and more than one of his contemporaries in their memoirs recorded that the gifs sometimes would be accompanied by suggestive photographs and offers of marriage.  Truly that was “working towards the Führer”.

Führer kitsch: A painting attributed to Adolf Hitler.

Hitler dutifully acknowledged the many paintings which were little more than regime propaganda although the only works for which he showed any real enthusiasm were those which truly he found beautiful.  However, he knew there was a place for the kitsch… for others.  In July 1939, while being shown around an exhibition staged in Munich called the “Day of German Art”, he complained to the curator that some German artist were not on display and after being told they were “in the cellar”, demanded to know why.  The only one with sufficient strength of character to answer was Frau Gerhardine "Gerdy" Troost (1904–2003), the widow of the Nazi’s first court architect Paul Troost (1878–1934) and one of a handful of women with whom Hitler was prepared to discuss anything substantive.  “Because it’s kitsch” she answered.  Hitler sacked the curatorial committee and appointed his photographer to supervise the exhibition and the depictions of farm-workers in the field and heroic nude warriors returned.

Kitsch: One knows it when one sees it.

What is kitsch will be obvious to some while others will remain oblivious and the disagreements will happen not only at the margins.  Although there will be sensitive souls appalled at the notion, it really is something wholly subjective and the only useful guide is probably to borrow and adapt the threshold test for obscenity coined by Justice Potter Stewart (1915–1985; associate justice of the US Supreme Court 1958-1981) in Jacobellis v Ohio (1964):

I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description and perhaps I could never succeed in intelligibly doing so. But I know it when I see it…

Kitsch also has a history also of becoming something else.  As recently as the 1970s, tea-towels, placemats, oven mitts, serving trays and plenty else was available in the West adorned with depictions of indigenous peoples, often as racist tropes or featuring the appropriation of culturally sensitive symbols.  These are now regarded as kitsch only historically and have been re-classified as examples variously (depending on the content) of cultural insensitivity or blatant racism.

Dome

Dome (pronounced dohm)

(1) In architecture, a vault, having a circular plan and usually in the form of a portion of a sphere, so constructed as to exert an equal thrust in all directions.

(2) A domical roof or ceiling; a polygonal vault, ceiling, or roof.

(3) Any covering thought to resemble the hemispherical vault of a building or room; anything shaped like a hemisphere or inverted bowl.

(4) In water management, (usually in dam design), a semidome having its convex surface toward the impounded water.

(5) In crystallography, a form having planes that intersect the vertical axis and are parallel to one of the lateral axes.

(6) In geology, an upwarp (a broad anticline (a fold with strata sloping downwards on each side) caused by local uplift).

(7) In geology, a mountain peak having a rounded summit (a structure in which rock layers slope away in all directions from a central point).

(8) As vistadome, in passenger vehicles (usually railroad cars), a raised, glass-enclosed section of the roof of, placed over an elevated section of seats to afford passengers a full view of scenery (not usually truly in the hemispherical shape of a dome).

(9) In horology, the inner cover for the works of a watch which snaps into the rim of the case.

(10) A building; a house; an edifice (obsolete except as a literary device).

(11) As heat dome, a meteorological phenomenon in which the interplay of high & low pressure atmospheric systems interact to produce static, warm air over a large area.

(12) To cover with or as if with a dome; to shape like a dome.

(13) To rise or swell as a dome.

(14) In slang, a person's head (the form chrome dome used of the bald).

(15) In slang (both military and in some criminal classes), to shoot in the head (often in the form “got domed”).

(16) In African-American slang, to perform fellatio upon.

1505–1515: From the Middle French domme & dome (a town-house; a dome, a cupola) (which persists in modern French as dôme), from the Provençal doma, from the Italian duomo (cathedral), from the Medieval Latin domus (ecclesiae; literally “house (of the church)”), a calque of the Ancient Greek οἶκος τῆς ἐκκλησίας (oîkos tês ekklēsías).  Dome is a noun & verb, domed & doming are verbs and domelike, domical, domish & domesque are adjectives; the noun plural is domes.

By the 1650s, the formalized use in architecture ensured the meaning was (more or less) standardized as “a round, vaulted roof, a hemispherical covering of a building” and thus the ultimate specialized evolution from the Greek dōma (a house, housetop (used especially of those with a roof “in the eastern style”), from domos (house), from the primitive Indo-European root dem- (house, household).  The medieval use of the German dom and Italian duomo as verbal shorthand for “cathedral” (essentially a clipping from “house of God”) was picked up in the imperfect way so many words entered English to describe architectural features in the style of hemispherical cupolas, the domes at the intersection of the nave and the transept, or over the sanctuary, characteristic architectural feature of Italian cathedrals.  The sense in English of “a building, a house” had been borrowed in English as early as the 1510s and was used mostly of stately homes and it endures but only as a literary device and it’s rarely seen outside of poetry.

The shape occurs to one degree or another in nature and is common in man-made objects and the built environment so dome is an often seen modifier (cake dome, pleasure dome, lava dome; onion dome et al) and appears in the opening lines of one of the most cherished fragments of English verse: Kubla Khan (1797) by Samuel Taylor Coleridge (1772-1834).

In Xanadu did Kubla Khan
A stately pleasure-dome decree:
Where Alph, the sacred river, ran
Through caverns measureless to man
Down to a sunless sea.

Some of the use has also been opportunistic and not especially domical.  Vistadomes were raised, glass-enclosed sections built into the roofs of railway carriages, placed over an elevated section of seats to afford passengers a better view of the scenery.  The idea was picked up by General Motors, the Oldsmobile Vista Cruiser station wagon (1964-1977), the Buick Roadmaster Estate (1991-1996) and the Scenicruiser busses (1954-1956 and made famous in the Greyhound livery some wore until the 1970s) all used raised, partially-windowed sections although none were officially described as “domes”.

The Hagia Sophia, now the main mosque in Istanbul; the minarets were added after the fall of Constantinople to the Ottoman Turks in 1453 and there are many architectural critics who maintain visually they improve the balance of the structure.  The illustration on the right shows how the Byzantine engineers used pendentives to make the construction of domes possible.     

Domes however are most associated with grand-scale, representational architecture (although quite a few builders of McMansions found them hard to resist).  One intriguing aspect of structural engineering upon which the integrity of a dome depends on what are called pendentives (the triangular segments of the lower part of a hemispherical dome left by the penetration of the dome by two semicircular vaults intersection at right angles).  Dating from 1727, pendentive was from the mid-sixteenth century French pendentif, from the Latin pendentem (nominative pendens) (hanging and the source of the English “pendulous”), the present participle of pendere (to hang) from the primitive Indo-European roots pen & spen- (to draw, stretch, spin).  What pendentives permit is the use of a circular dome over a square void square room or an elliptical one over something rectangular room.  Pendentives, (geometrically the triangular segments of a sphere), taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base as required.  As structural supports, pendentives distribute the bulk of a dome’s weight to the four corners (the strongest points) and ultimately to the piers and the foundations below.  The classic example is the Hagia Sophia, the sixth century Byzantine cathedral at Constantinople (modern day Istanbul).  It was converted into a mosque when Constantinople fell to the Ottoman Turks in 1453 and, after a century-odd as a museum, is again a mosque.

Scale model of Germania.  Hitler would spend hours pondering the details but in 1945, he spent even longer looking at the model of what was planned for the Austrian city of Linz where he'd decided to have his tomb installed.

Domes have long been a favorite of emperors, dictators and those other megalomaniacs: architects.  A truly monumental one would have been the Volkshalle (People's Hall and known also as the Große Halle (Great Hall) & Ruhmeshalle (Hall of Glory), the centerpiece of Adolf Hitler’s (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945) never realized plan to re-built Berlin as Germania, a worthy Welthauptstadt (world capital) of his “thousand year Reich”.  Although Albert Speer (1905–1981; Nazi court architect 1934-1942; Nazi minister of armaments and war production 1942-1945) was Germania’s chief architect, in some aspects he was really a glorified draftsman, correcting the technical errors in the drawings passed to him by the Führer who had be sketching parts of the design since the early 1920s.

Even by the standards of the super-dimensionality which was characteristic of the Third Reich, the domed hall would have been extraordinary.  The oculus would have been 46 m (151 feet) in diameter which would have accommodated the entire rotunda of Hadrian's Pantheon and the dome of St Peter's Basilica.  The  250 m (820 feet) diameter of the dome was (and this was a signature of Speer’s approach), bigger even than Hitler had requested and he was much displeased to learn of a rival architect’s plans for a dome 15 m (49 feet) greater in diameter to sit atop the city’s new railway station.  As things turned out, none of the grandiose structures were ever built and although a tinge of regret can be found in Speer’s post-war thoughts, even he admitted the designs were a failure because of “their lack of human scale”.

Berlin's rebuilt Reichstag with steel & glass dome.

Berlin did however eventually get a new dome, albeit it one rendered not in granite but the glass and steel the Führer thought was fine for factories and warehouses but which would have appalled him as a method of construction for public, representational architecture.  Plonked atop the rebuilt Reichstag, it was said to symbolize the reunification of Germany although quite how it managed that has never really been explained although the distinctive structure has become a city landmark and people seem to like it.  A clever design, it sits directly above the chamber of the Bundestag (the lower house of the bicameral federal parliament) and permits public observation, the clever design also reducing energy use by optimizing the input of natural light while moving shrouds minimize glare and heat-soak.

Cinerama Dome, Los Angeles in 1965, the year of its greatest commercial success.

The Cinerama Dome movie theatre sits on Hollywood’s Sunset Boulevard.  Opened in 1963, the Cinerama Dome introduced a new concept for film projection, a curved screen which sat inside a geodesic dome based on the design developed by US systems theorist & architect Richard Buckminster Fuller (1895–1983), one attraction of which was such things could be built at lower coast and in much less time than a conventional theatre building.  Intended to be the first of perhaps thousands around the planet, it was built in a still remarkable four months but it remains the only concrete geodesic on the planet and while it has operated intermittently since being closed during the COVID-19 pandemic, its future is uncertain and although it will probably be preserved as a historic building, it’s likely to be re-purposed as retail or restaurant space.

Lindsay Lohan at the Scary Movie V premiere, Cinerama Dome, April 2013.

The end of the line for Cinerama is another marker in the evolution of the technology which underpinned the evolution of the US economy from one based on agriculture, to one increasingly industrial to one geared around the military & entertainment.  In the 1950s, cinema’s greatest challenge came from television and the film studios fought back by creating differentiation in their products.  The venture into 3D proved a cul-de-sac for a number of reasons but one thing cinemas could do was make their big screens huge and during the 1950s the wide-screen Cinemascope enjoyed a boom.  However, there was a limit to how much screens could grow, hence the interest in Cinerama which projected onto a curved screen designed to take advantage of the way the human eye sees and processes images, the system at its best when provided by three synchronized projectors.  The idea lives on in the curved screens which have become popular among gaming freaks who enjoy the sense of “envelopment”.  It was also the era during which populations moved further from city centres into suburbs and thus, cinemas also needed to move, more of which (but often smaller) would be required.  Thus the attraction of the geodesic dome came which, largely pre-fabricated, was cheap to produce and quick to assemble.  However, Cinerama was expensive to film, to print, to produce and the sheer size and weight of the prints meant it was costly even to ship the material to venues and the conversion process to something which could be used with conventional projection.

Heat Domes

July 2023 Global heat map from the Climate Change Institute, University of Maine, USA.  For those unconvinced, Fox News continues to provide alternative facts.

The “heat dome” is a weather phenomenon, the physics of which has for decades been understood but of late the term has entered general use as much of the northern hemisphere has suffered from prolonged, unusually high temperatures, July 2023 measured as the hottest month ever recorded.  A heat dome occurs when a large, high-pressure system traps and concentrates hot air in a specific region, leading to prolonged and extremely high temperatures. Under a heat dome, the atmospheric pressure aloft prevents the hot air from rising and dissipating, effectively acting as a lid or cap over the area, thus the image of a dome sitting over the land.

The UK's Royal Meteorological Service's simple illustration of the physics of a heat dome.  Heat domes are also their own feedback loop.  A static areas of high pressure which already contains warm or hot air trapped under the high will become hotter and hotter, creating a heat dome.  Hot air will rise into the atmosphere, but high pressure acts as a lid and causes the air to subside or sink; as the air sinks, it warms by compression, and the heat builds. The ground also warms, losing moisture and making it easier to heat even more.

Implosion & Explosion

Implosion (pronoubced im-ploh-zhuhn)

(1) The act of imploding; a bursting inward (opposite of explosion).

(2) In phonetics, the occlusive phase of stop consonants; the nasal release heard in the common pronunciation of eaten, sudden, or mitten, in which the vowel of the final syllable is greatly reduced.

(3) The ingressive release of a suction stop.

(4) In clinical psychiatry, a type of behavior therapy in which the patient is repeatedly subjected to anxiety-arousing stimuli while the therapist attempts to extinguish the patient's anxiety and anxious behavior and replace them with more appropriate responses.

1829: The construct (modelled on explosion) was im- + (ex)plosion.  The im- prefix was from the Latin im-, an assimilated form of in- and used to express negation (not).  The prefix -in is quirky because it can act either to negate or intensify.  The general rule is that when pre-pended to a noun or adjective, it reinforces the quality signified and when pre-pended to an adjective, it negates the meaning, the latter mostly in words borrowed from French.  The Latin prefix in- was from the Proto-Italic en-, from the primitive Indo-European n̥- (not), the zero-grade form of the negative particle ne (not) and was akin to ne-, nē & nī.  In Modern English it is from the Middle English in-, from Old English in- (in, into), from the Proto-Germanic in, from the primitive Indo-European en.  Plosion was a word from the jargon of phonetics meaning the pronunciation of a consonant characterized by completely blocking the flow of air through the mouth and was a derivative of explosion, first coming into use in 1915–20 as a shortened form of explosion.  Implosion, coined as an opposite of explosion, was first published the Westminster Review in 1829.  There was a technical need for the word because, in popular use, many chemical reactions which resembled explosions were described thus, even though, as in the case of a mixture of hydrogen and oxygen, instead of an enlargement of bulk, a positive quantity, the result was is a negative one, tending towards a vacuum.

OceanGate’s diagram of Titan.

In response to the questions raised after it was confirmed OceanGate's Titan submersible had suffered a catastrophic implosion event, US Navy sources commented on the process:  When a submarine collapses (implodes), the hull material moves inward at a speed of around 1500 mph (2400 km/h) or 2200 feet (670 m) per second and the time required for a complete collapse is about 1 millisecond.  Typically, the human brain responds instinctively to stimulus at about 25 milliseconds and those with untypically fast reaction responses can begin to act at around 150 milliseconds.  The atmosphere inside a submarine contains a relatively high concentration of hydrocarbon vapors and this contributes to the space behaving something like the compression cycle in a very large diesel engine: The air auto-ignites and an explosion follows the initial rapid implosion.  A human in these circumstances is transformed into large blobs of fats and these the extreme temperature incinerates and turns to ash in little more than a second.  Navy sources also expressed scepticism at the desirability of constructing a hull from a mixture of materials (titanium and carbon-fibre) in vessels operating at depths where the pressure is extreme (where the wreck of the Titanic lies it’s some 400 times that which prevails at sea level).  The argument is that wherever the two materials meet is the point at which, over time, a weakness is most likely to form.  Because the Titan's tubular hull was made from carbon fibre, it's thought that rather than behaving like the metals used in submarine construction, it would to some extent fragment although the nature of the disintegration won't be known until the wreckage is examined.

Engineers however noted the consequences of the explosion (for both machine and people) could differ greatly from the historic experiences of such events at depth because they all involved vessels made from metal which tends to retain its inherent integrity, even as the structural integrity of the construction fails.  Additionally, many of the previous examples were spherical so the internal forces were equalized for the split-second during the critical event whereas Titan was tubular with what would, under the stresses imposed, become detachable titanium end-caps.  Titan's hull was built from carbon-fibre which, under the specific pressure encountered would have behaved differently from metal and may have fragmented.  The physics of all of this means the temperatures and dynamic forces experienced within Titan in that split-second may have been very different from the models generated by historic experience but until the wreckage and any human remains are examined, the details of the brief event will remain unclear.  The incident however is anyway likely to discourage the use of carbon-fibre hulls in submersibles but whether it has any implications for use in aviation will be interesting.  Building the fuselages of passenger airliners from carbon-fibre has many advantages and the stresses imposed are very different to those at depth but there is no real-world data to assess how the material will behave over the decades the airframes may operate.        

Historically, the difference between a “submersible” and a “submarine” was that a submersible was a vessel which operated usually on the surface but was able to submerge for short periods for purposes such as launching attacks on other vessels or attempting to avoid detection while a submarine was able to operate underwater for extended periods.  The definitions were (more or less) formalized after 1945 when “true” submarines were developed, rendering obsolete the traditional submersibles which gained their name as a clipping of “submersible boat”.  When nuclear propulsion was adopted, the duration of the craft was extended further, the primary limitation being the volume of food able to be stored.

The definitions have shifted somewhat although traces of the older distinctions remain.  For practical purposes, a submarine is a large, complex vessel able to undertake independent and extended underwater operations and although most associated with navies, there are many civilian operators of submarines.  In recent decades, submersibles have no longer been designed for sustained surface use (although some of the recent creations by drug smugglers appear to be exactly that) and are dedicated to and optimized for the undersea environment.  They can be just about any type of vehicle or apparatus capable of operating underwater, crewed or un-crewed and in an array of sizes and configurations for use in fields such as scientific research, exploration or underwater photography.

Implosions: Implosions do occasionally afflict storage tanks and the Mythbusters television series (past masters at explosions, on this one episode they forsook blowing stuff up and imploded something instead) attempted to create the conditions which “naturally” would provoke the phenomenon.  It proved difficult and the implosion eventually was induced by artificially reducing the internal pressure.

Explosion (pronounced ik-sploh-zhuhn)

(1) An act or instance of exploding; a violent release of energy resulting from a rapid chemical or nuclear reaction, especially one that produces a shock wave, loud noise, heat, and light (or the noise itself).

(2) A sudden, rapid, or great increase.

1615-1625: From the French explosion, from the Latin explōsiōnis, a genitive form of explōsio, from explōdo (I drive out by clapping) from explōdere (to explode), the construct being ex- (the prefix from Middle English from words borrowed from Middle French from the Latin ex (out of, from), from the primitive Indo-European eǵ- & eǵs- (out). It was cognate with the Ancient Greek ἐξ (ex) (out of, from), the Transalpine Gaulish ex- (out), the Old Irish ess- (out), the Old Church Slavonic изу (izu) (out), and the Russian из (iz) (from, out of)) + plōdo (I clap or I strike).  The figurative of "going off with violence and noise" is from 1660s and some sources insist the sense of "rapid increase or development" wasn’t noted until 1953 when it came to be used in commerce (describing both the extraordinary proliferation of consumer products in what would later come to be known as the “affluent society” and spikes in demand).  In the mid 1940s, the US conducted a number of nuclear weapon tests at Bikini Atoll in the South Pacific and when asked about his choice of “bikini” as the name for the fetching swimwear he trademarked (patent #19431) in 1946, the designer is reported to have at the time remarked he expected an "explosive commercial and cultural reaction" as dramatic as one of the Pentagon’s A-bombs.  The figurative use thus dates from at least the 1940s and it would seem at least plausible that in that vein the word had been used for a long time, centuries of wars exposing millions to explosions surely likely to have inspired the linguistic imagination.

In Ancient Rome, at the conclusion of a play, the actors would turn to the audience and command plaudite! (literally "clap your hands!); that's the source of the English plaudits (a mark or expression of applause; praise bestowed) and of the idea of the plausible (something to be applauded).  However, if the performance was a dud, the audience would explodo (the construct being ex- (out) + plaudo (clap), the idea being the actors is the dreadful performance would be "clapped off then stage" and as late as the seventeenth century the phrase persisted, surviving reports from critics recording "the crowd exploded him off the stage".  Indeed, even now, phrases like "the theory has long been exploded" are still sometimes seen although whether the writer has in mind the idea or "clapped away" or "blown up" may be uncertain. 

Figurative use: Lindsay Lohan with former special friend Samantha Ronson, the photograph taken in Mexico and dating from October 2008.

In figurative use, "implosion" and "explosion" frequently are used to describe different events or phenomena, the former often related to sudden and dramatic changes and while the latter can be used in this way, implosions can be imagined as gradual things which unfold over a long time, sometimes even years.  That said, there are some “explosions” which are regarded so only because of their peculiar context, such as the “Cambrian explosion” which was sudden and dramatic only against the measure of the evolutionary history of life on Earth.  The Cambrian Period, while a relatively brief period in the planet's four and a half billion years-odd of existence still encompassed in excess of forty million years (circa 540-485 million years ago).  During this time, there was a remarkable diversification and proliferation of complex multi-cellular life forms in the oceans and it was “explosive” in the sense nothing like it had happened before and in evolutionary terms, the appearance and diversification of an array of complex organisms (including the first appearance of animal groups or phyla which remain extant) was rapid indeed.  Still, that sort of figurative use of “explosion” tends to be restricted to evolutionary biologists and their ilk and it’s more familiar when used to describe something short & sharp like the rapid acceleration of a running back on the football field.  That would be over in seconds but in sport, something like the innings of a cricketer might be called “explosive” even if it unfolds over an hour or more.  It’s all a matter of context and literal explosions tend by their nature to be fast, brief events.

Just about any dictionary would define an explosion as something like “a rapid and forceful outward expansion or release of energy”, conveying the idea of something bursting forth or erupting with great intensity, impact, or noise and that’s familiar from the event associated with impacts, bombs and even volcanic eruptions which, although they can last for weeks are really only an explosion of short duration, following by consequential events like mud or lava flows which can last weeks.  However, far away (and long ago by the time we find out), there are explosions which are on such a scale they can take months.  There are lots of stars and sometimes, they explode.  In a sense, nothing lasts forever, yet at the same time, matter is, in one form or another, eternal.  Explosions are part of this process.  Quite how many stars exist is unknown and given we can observe only part of the universe, any estimate beyond a certain point is meaningless although, given calculations based on observable data suggest that there are at hundreds of billions of galaxies, each of which probably contains millions or billions of stars.  So, estimates (guesses) vary but the fact 1 septillion (1 followed by 24 zeros) is thought credible is interesting, not for the specific value it represents but because it means whatever might be the answer, it’s a very big number.  The time it takes for a star to explode depends on the type of star and the point it’s reached in its evolution but the two most significant types of stellar explosions are (1) supernovae and (2) stellar novae.  The mechanics and time absorbed by each in their explosions varies greatly.

A supernova is a powerful and catastrophic explosion which occurs at the end of the life of a massive star (or in a binary star system) and it can take (as seen from Earth) from a few weeks to several months.  As a prelude, over millions of years, the star will undergoes various stages of nuclear burning and fusion, culminating eventually in a catastrophic collapse and explosion.  Less energetic is a stellar novae which occurs in binary systems where a white dwarf star accretes matter from its companion star.  The accumulation of matter on the surface of the dwarf can lead to a sudden and rapid release of energy, resulting in a nova explosion.  Novae typically brighten over a short period, reaching peak brightness in a matter of days or weeks, after which they gradually fade away over several months.  Not all stars end with an explosion.  Less massive bodies (like our Sun) don’t explode but kind of fade away through a process cosmologists call stellar evolution, expanding into red giants, shedding their outer layers, eventually to be become white dwarfs on the path to dark, dead obscurity.  Back on Earth, the figurative use extends from a rapid increase in popularity of someone or something to sudden outbreaks of violence by individuals or entire societies and something said or done which might induce either of the latter can be said to be “potentially explosive”.

Conversely, “implosion” is used figuratively to describe an internal collapse or inward sinking, rather than an outward burst although the latter may be consequent upon the former.  It’s suggestive of a situation or event where there is (suddenly or gradually) failure, disintegration, or decline, typically accompanied by a loss of control or power and implosions are often associated with the gradual accumulation of pressures or internal forces that eventually lead to a collapse or breakdown.  Individuals, institutions or societies may be said to have imploded because they lacked the strength, internal cohesion or resources to resist pressures which may be externally imposed, generated internally or a combination of both.  However, although both explosion and (probably more frequently) implosion are among the general population commonly used terms when discussing aspects of metal health (usually of others), they’re officially not part of the lexicon of clinicians or other professionals in the field.  It may be that the words are sometimes in their thoughts when faming a diagnosis but neither appears in the American Psychiatric Association's (APA) Diagnostic and Statistical Manual of Mental Disorders (DSM) which for decades has provided a standardized classification and criteria for diagnosing mental disorders.

An explosion: A simulation of the detonation of the Soviet Union’s AN602 Царь-бо́мба (Tsar Bomba), a thermonuclear gravity bomb which was the most powerful nuclear weapon yet built (as far as is known) or tested.  It was detonated on 30 October 1961 on a remote island in the Barents sea and the Russian claim of a yield equivalent to 50 megatons of TNT is now generally accepted (the contemporary US estimate of 57-60 was based on more remote observations).