Chopine

Chopine (pronounced choh-peen or chop-in)

(1) A shoe having a thick sole, usually of cork, suggesting a short stilt, worn especially by women in Europe in the sixteenth & seventeenth centuries and said to have been introduced from the Ottoman Empire.

(2) A bottle of wine (usually Bordeaux) containing 250 ml, 1/3 of the volume of a standard bottle.

1570–1580: From the Middle French chapin, from the Old Spanish chapín (type of high shoe or clog, raised by means of a cork sole), from chapa (plate of metal), the construct being chap(a) (from the Middle French chape) + -in (the adjectival suffix).  The original, the Old Spanish chapín, was probably imitative of the sound made by the shoe when walking.  Dictionaries note a number of cognates of chopine including choppins & chapiney but, as might be imagined, it must have been a word in limited use (by cobblers, fashionistas etc) because there are no entries for the word (or similar forms such as cioppino or choppino) in English / Italian dictionaries of the late sixteenth or early seventeenth centuries; perhaps it was at the time: "The shoe that dare not speak its name".  It's possible the equivalent in Renaissance Italian was zoccolo (familiar as the English plural "clogs") which may come from the Italian zocco (stump or block of wood) but adding to the murkiness, in one English / Italian dictionary, the word chopinos appears in the definition of the plural zoccoli.  Chopine is a noun; the noun plural is chopines.

Portrait de Chopin en Dante (drawing of Chopin as Dante, 1849), graphite pencil on paper by Eugène Delacroix (1798–1863), Eugène Delacroix National Museum, the Louvre, Paris.  Inscribed Cher Chopin (Dear Chopin), the drawing is believed to have been sketched on 31 October, 1849, upon the artist learning of the composer's death some two weeks earlier.  It remained in Delacroix's bedroom until his death.

Unfortunately, chopiner is not an English noun meaning “one who makes or wears chopines” but a French verb meaning “to drink to excess” while the English adjective Chopinian carries the sense “of or pertaining to the Polish composer & virtuoso pianist Frédéric Chopin (1810-1849)”.  A macabre footnote in Chopin's story is that Hans Frank (1900–1946; Nazi lawyer and governor of the General Government (1939-1945) in German-occupied Poland during World War II), whose rule in Nazi-occupied Poland was an appalling and bloody tale of corruption and depravity, when on trial for war crimes and crimes against humanity, in all seriousness (as an experienced trial lawyer) offered in mitigation for his conduct the fact he'd established in Kraków a Chopin Museum, something he noted: “the Poles had never managed to do”.  The belated attempt at redemption came apparently at the instigation of Dr Joseph Goebbels (1897-1945; Nazi Minister of Public Enlightenment and Propaganda 1933-1945) who, although as evil as any of the Nazis, was at least clear-headed enough to understand carrots were in occupied territories at least as useful as sticks.

Defendants in the dock at the First Nuremberg Trial (Frank circled).

Acting under instruction from Berlin, Frank’s regime actively had attempted to eradicate Polish culture and while his methods were never subtle, the worst excesses included mass-murder of “the intelligentsia” (writers, artists, journalists, academics, priests etc) but the governor-general, bizarrely, had a personal obsession with Chopin, based on a genuine fondness for the music and many had been drawn to what been described as its “quasi-improvised” quality; the French composer Georges Bizet (1838–1875) spoke of Chopin’s work as “…charming, strange, unique, inimitable”.  Frank too clearly was charmed but understood the long dead composer would need to be “Germanized” to be acceptable in the Third Reich (1933-1945), taking measures such as spelling his name in a Germanic-sounding “Schopping” and banning performances of his compositions for Polish audiences.  The centrepiece of this improbable Nazi attempt at cult-creation was what Frank called the “temporary” Chopin Museum in his official headquarters at Wawel Castle in Kraków, a permanent structure to be erected once Germany had won the war.  In typical Nazi style, Frank dispatched his (by then well-experienced) agents to loot occupied Europe for Chopin artifacts, manuscripts, letters, death masks and memorabilia, managing to acquire (ie steal) even an original Pleyel grand piano that had belonged to the composer.  Despite that interest, in May 1940 he had made only a token attempt to prevent the destruction of the famous bronze Chopin Monument in Warsaw's Łazienki Park, the 16-ton statue cut into pieces and melted down for the benefit of the German war machine.

The Nuremberg Trial, 1946 (1946), oil on canvas by Dame Laura Knight RA (1877-1970), IWM (Imperial War Museum), London.

Dame Laura Knight’s large canvas The Nuremberg Trial, 1946, now hangs in the Imperial War Museum in London and is one of the most re-produced images from the trial.  An unusual blend of two aspects of realism achieved by a juxtaposition of defendants in the dock and a devastated Nuremberg cityscape (including corpses), the artist did change a few details to suit her didactic purposes, Hans Frank seated not in his usual place but at the painting’s bottom-right, presumably better to show the wrists damaged by a failed suicide attempt.  In court, Frank wore gloves to conceal the effect but these Dame Laura choose to remove.  Curiously for such an accomplished artist, some of the likenesses achieved of those in the dock are not impressive but it remains one of the trial’s most memorable images, despite at the time being received by the critical establishment without enthusiasm.

Sketch of Frank in the dock by New Zealand-born political cartoonist David Low (1891-1963).

For the museum’s opening ceremony, Frank personally selected Ludmilla Berkwic (1910–2005), a fine Polish concert pianist and piano teacher who, on Chopin’s Pleyel, preformed several pieces for an audience of high-ranking Nazis, the recital very well-received.  Unfortunately, Frank’s staff hadn’t dug too deep and what they failed to detect was that Ms Berkwic had since the start of the war being living under false papers because her father's family was Jewish.  That might have gone undetected were it not for Dr Goebbels having arranged for the performance to be filmed and, in an attempt to show how benign was Nazi rule in Poland, distributed throughout Europe on propaganda newsreels.  By 1943 he probably realized that might be a futile project but his energy for the Sisyphean task never waned.  However, an unexpected consequence of the publicity was it prompted one of Ms Berkwic’s jealous rivals to denounce her for having Jewish heritage.  That forced her and her mother to obtain from the Polish Underground new sets of forged papers and, strange as it sounds, they fled to Germany where they could be absorbed into the millions of captive Polish workers.  Hiding, as it were, “in plain sight”, she survived the war working in a munitions factory and in 1947 emigrated to the US, setting in New York.  Frank’s gesture did not make much impression on the judges of the IMT (International Military Tribunal) sitting for the first Nuremberg Trial (1945-1946): They convicted him on counts three (war crimes) and four (crimes against humanity) and handed down a sentence of death by hanging.  As a trained lawyer, Frank was at least a realist, the prison psychologist recording that when asked his reaction to the verdict, Frank had smiled when answering: “I deserved it and I expected it.”  Unlike the most recalcitrant of the defendants, he seemed aware too of the magnitude of the crimes being tried, admitting: “A thousand years will pass and still this guilt of Germany will not have been erased.”  Some of what Frank stole for “his” Chopin Museum was recovered and today, the most comprehensive collection of the composer's memorabilia is housed in the official Fryderyk Chopin Museum in Warsaw, established in 1954 and operated by the Fryderyk Chopin Institute.

The ultimate platform shoe

How they worked.  Chopines were a kind of wonder bra for the feet.

Chopines began as a purely functional device; a means of raising women’s shoes and the hems of their dresses above the dirt and filth in which they were often compelled to walk; in the age of horse-drawn transport, streets sometimes were "rivers of blood, mud and horseshit".  It's said the chopines were brought to Europe by traders from the Ottoman Empire where they'd been worn in bath houses by concubines, courtesans and others, the speculation being they were originally a modestly proportioned device designed as a health measure, a means of protecting the feet from infection, bath houses being warm, dark and moist, the perfect incubation environment for bacteria.  As sometimes happens, they became a status symbol with prestige determined by their elevation, the tallest extant examples reaching 20 inches (508 mm) although some historians claim they were built as much as ten inches (254 mm) higher.  Students of the art suspect that if true, such things may have been constructed for shop-window displays rather than being worn because at that height they're really "stilts".  Beyond a certain height, practicality (ie stability) would certainly have become marginal but there's evidence highly stylized examples were worn outside the bath house on ceremonial occasions, the wearer presumably "mostly static".  Chopines were most popular in Spain and Italy in the late sixteenth century and when they spread to England, they were sometimes referred to as "the Venice" because of the perception that was their city of origin, a notion that seems to have arisen because of their mention in widely-read travel journals of the age; Venice was a popular destination for such travellers.  Their impracticality must have made them a niche item because they never became part of any defined English costume or style of dress but whether alpha-males objected to women suddenly appearing taller is lost to history.

Variations on a theme of chopine.

As shoes, they had a short life because their sheer size dictated they be made from lightweight materials like cork and wood although some surviving examples do have a metal framework.  The style, in a less extreme form, was briefly revived with the cork-soled platform soles of the 1970s which had the effect of creating a short-lived investment bubble in the Portuguese cork industry although, as economic theory would predict, as the craze faded a Portuguese "cork glut" saw prices collapse.  The absurdity of the style attracted the attention of writers:

"It is ridiculous to see how these ladies crawl in and out of their gondolas, by reason of their choppines [clogs]; and what dwarfs they appear when taken down from their wooden scaffolds; of these I saw nearly thirty together, stalking half as high again as the rest of the world."  (John Evelyn, diary entry, June 1645)

"By'r lady, your ladyship is nearer to heaven than when I saw you last by the altitude of a chopine." (Hamlet, act 2 scene 2, William Shakespeare, 1602)

"He creaked to and fro, tiptoing up nearer heaven by the altitude of a chopine... "(Ulysses, James Joyce, 1922).

Continuing the chopine tradition but with rather less elevation: Lindsay Lohan in Saint Laurent Billy leopard-print platform boots, New York, March 2019.

Shoes have not since ascended to the heights of the chopines but the attractions of elevation have endured.  The lovely elegance of a five-inch stiletto heel of course remains incomparable but while as a piece of design they’re there to be admired, at a certain point a stiletto becomes unstable.  As a piece of math, heel stability can be reduced to about as complex a problem in mechanics as one cares to make it, the significant variables being the heel height, heel-tip area, shoe geometry, the wearer’s centre of mass, foot position, ground reaction force, and the stiffness of the shoe & ankle as an encapsulated system.  So, the “tipping / stability problem” can be conceptualized (even if individual human variations make it difficult to produce a simple model) and the basic idea is that when standing, ground exerts a “vertical ground-reaction force” through the foot; if the shoe is stable, resultant force falls within the “support polygon” (essentially the area defined by the heel and forefoot contact points).  As a general principle, a shoe’s sole being broad and long (thereby distributing forces over a large contact area), what is critical is the heel, a structure with a much smaller contact area.  Essentially, the remains stable as long as pressure doesn't move beyond the available support area.

Saint Laurent Billy leopard-print platform boots from the Pre-Fall 2018 collection.  The large contact area of the kitten heel and height of the sole means stability is achieved but the style does demand some practice because one's "walking technique would need slightly to be adjusted.  

However, the slenderness of the stiletto operates as a multiplier effect, the heel height changes the geometry of the entire foot, not merely the size of the heel.  As the heel’s height increases, the foot shifts into plantar flexion causing a movement of the upper body, meaning the centre of mass relative to the heel changes.  For any given individual, with enough data points quantified, it would be possible to produce an equation that would find a “point of optimal stability” before increasing a heel's height induces “tipping”.  Beyond the “tipping point”, a shoe ceases to be neutrally stable and achieving a static equilibrium isn't possible without muscular compensation or movement.  That can be modelled in software but the practical complication is a human is not a rigid object standing atop an always flat, unmoving surface, ankle, foot and leg continually make corrections, often so minute and instinctive they’re imperceptible to the owner of those body parts.  Thus, a stiletto can statically be geometrically stable yet dynamically unstable.  That’s why heel-tip diameter is so critical in achieving stability and to illustrate that, imagine an example demonstrating not all four-inch (100 mm) stilettos have the same intrinsic stability.  Consider two otherwise identical 100 mm stilettos, one with an 8-mm heel tip, one with 20-mm, the latter allowing a greater movement of the centre of pressure before the ground-reaction force reaches the edge of the heel.  Math nerds can no doubt run the numbers and what they’d find is the intriguing result that doubling the heel height roughly halves the angular tolerance, while doubling heel-tip radius roughly doubles it.  Women used to stilettos of course don’t need an equation to tell them a shoe with an extremely narrow, high heel has a very small stability envelope; the "heelprint" is a vital part of the "footprint".

Lindsay Lohan in Christian Louboutin Madame Butterfly black bow platform booties with six-inch (150 mm) stiletto heel.  What the elevated sole does is change the foot's angle, meaning a similar stability is attained as would be achieved with a 100 heel used in conjunction with a conventional sole.

Hence the frequent use of thicker soles and while opinion can be divided on the look, the elevated platform mechanically is interesting because it allows the heel to be higher while keeping the foot at a less extreme angle; it’s a fudge and not always admired by those for whom the acute angle of the wearer’s foot is one of the most alluring aspects of the stiletto’s aesthetic but if done well, it can be pleasing; it’s not the classic look but needs to be judged on its own terms.  An example of the math is one of differentiation: A 120-mm heel with a 30-mm platform doesn't behave like a 120-mm heel on a flat platform; because of the additional height in the sole, the effective pitch (and thus stability) will be something like a shoe with a 90-mm heel and conventional sole.  Engineers call this the TBA (true biomechanical angle) and in the practical mechanics of the human foot it's of significance because the foot safely can tolerate only a certain maximum angle of incline angle before the ankle undergoes structural plantarflexion failure (where the foot is extended so straight the ankle loses all lateral muscle control).  All this was once a rarely explored exercise in equation-making because shoe designers could tell by looking at design whether it would be practical to wear; they didn’t need the math.  Engineers building humanoid robots did however need to do the sums even though they could, if need be, emulate millions of years of evolution and make feet and ankles more accommodating.  As the recent Humanoid Robot Olympics (August 2026) in Beijing demonstrated, the billions of dollars invested under the watchful eye of the CCP (Chinese Communist Party) must have resulted in many correct calculations because what was achieved was impressive (including breaking the world record for the men's 100 metre sprint).  While the CCP surely is interested more in robots for factories and the military than “making a better stiletto”, it’s not impossible a Chinese scientist might gain a Ig Nobel Prize by publishing a by-product of humanoid robot research: the equation for the “perfectly stable stiletto”, designers able to “plug-in” their angles and dimensions meaning the “stability threshold” ceases to be theoretical and becomes just another metric.

Flamingo's Exotic Dancer's boots in baby pink are an example of what can be done if one can cast adrift what's possible from the moorings of what's practical.  Available in calf (left), ankle (centre) and thigh (right) length in a variety of heel and sole heights, there's both a commonality of design elements and interchangeability of components, meaning a high degree of production-line rationalization, making the range economic to produce.  It should be noted "exotic dancer" is a vocational euphemism so the target market is limited but there may be some demand from non-professionals who can see the potential for "home use".

Style by necessity, Paris circa 1942: The chopine's methods of construction and use of materials staged a partial comeback in occupied France (1940-1944).  The sculptured heel both lent style and reduced weight.

Wartime shortages of leather forced French cobblers to turn to more readily available materials such as wood or cork when repairing or replacing heels and soles and the improvisation quickly became characteristic of French footwear during the Nazi Occupation.  Of course, being French, mere functionalism wasn’t enough and identifiable styles emerged, creating a unique “fashion language”; in other words, a fine example of wartime necessity becoming fashion.  Supplies of leather for civilian consumer goods greatly were restricted in many countries during wartime but in places subject to Nazi occupation the deprivations were most severe with the German war machine absorbing the bulk of what was available.  Consequently, French shoemakers increasingly substituted wood, cork, textile, straw and whatever artificial materials could be adapted or re-cycled with wooden clogs becoming a common sight.

French open-toed pumps, circa 1944, Bata Shoe Museum, Toronto, Ontario, Canada.

Constructed on a wooden sole & heel with a raffia upper, the shoe is embellished with a polka-dot ribbon, the only leather component two small cuts for the contact areas of the sole and heel, covered with re-cycled material.  Although a product of necessity, the raffia/word combo does sometimes appear still in modern catalogues and, of course, polka-dots never really go out of style.  So, material supply was a problem but if anything that may have encouraged designers to explore the possibilities offered by materials not previously exploited.  Rather than simply forming blocks of wood or cork into a simple wedge that would have “done the job”, the photographic record makes clear women were wearing raised soles (some quite substantial platforms) and sculptural heels, some as extravagant as was possible within the limitations imposed and augmenting this, ribbons provided considerable scope for decorative variation; in a quirk of the wartime economy, ribbons were for some time among the few materials not subject to rationing.  Cobblers proved imaginative and French commerce rose to the occasion, shoe shops developing a fashion vocabulary: semelles compensées (platform/wedge soles) and semelles articulées (articulated soles) among the coinings.

Semelles articulées, Paris, circa 1942.  The look was soon in vogue.

The articulated creations were ingenious attempts to make wooden soles flexible enough for walking and while it was not possible wholly to emulate the behavior of leather, there were partial solutions, one using thin wooden strips and in 1941 there was the more intricate Smelflex in which the articulation interacted with laminated or hinged sections of wood; with dark irony, the occupying authorities noted the system was derived from a German patent.  In an example of the way in which populations adapt to circumstances, the look became a recognised fashion phenomenon of Occupation-era France and designers made no attempt to disguise their creations as leather, the wooden soles and heels presented explicitly as a blend of “ingenuity and Parisian elegance.”  In an amusing footnote, the shortage of leather and metal did answer the many pre-war complaints about the trend for extremely high, thin talons-échasses (stilt heels) that much pleased the men as they gazed at their drawing boards in Parisian fashion houses but were far from comfortable to wear for much beyond a photo-shoot for a glossy magazine.

Mr Putin (Vladimir Vladimirovich Putin; b 1952; president or prime minister of Russia since 1999, left) with Xi Jinping (b 1953; General Secretary of the CCP (Chinese Communist Party) and paramount leader of the PRC (People's Republic of China) since 2012, right) (far left), Carla Bruni-Sarközy de Nagy-Bocsa (b 1967, left) and her husband Nicolas Sarközy (b 1955; President of France 2007-2012, right) (centre left), Marco Rubio (b 1971; US secretary of state since 2025) (centre right) and how it's done (far right).

In politics, the chopine lives on in the form of "elevator shoes" that can "add" as much a four inches (100 mm) to an individual's height through the mechanism of the "built-up" internal heel.  Politicians are known to wear them including Mr Putin, Mr Sarközy and Mr Rubio, indeed the latter's use of the shoes was exploited by Donald Trump (b 1946; POTUS 2017-2021 and since 2025) who coined "little Marco" as his opponent's moniker during the 2016 Republican presidential debates although that use is in abeyance while they maintain their at least temporary friendship.  As the elevation increases it's obviously necessary also to add to the upper so (1) the trick is concealed and (2) the ankle retains some lateral support; that's why many elevator shoes are really "elevator boots".  Either way, they work best if trousers are cut accordingly; done well, worn by a well practiced wearer, they should be unobtrusive unless closely inspected.

Tactile

Tactile (pronounced tak-til or tak-tahyl)

(1) Of, pertaining to, endowed with, or affecting the sense of touch.

(2) Perceptible to the touch; tangible.

(3) Capable of being touched; tangible (archaic).

1605–1615: From the Middle French tactile, from the Latin tāctilis (tangible), from tāctus, past participle of tangere (to touch)), from the primitive Indo-European root tag (to touch; to handle).  The construct was tact(us) + ile.  The –ile suffix was from the Latin –īlis (neuter -ile, comparative -ilior, superlative -illimus or -ilissimus; the third-declension two-termination suffix), from the Proto-Italic -elis, from the primitive Indo-European -elis, from -lós.  It was used to form an adjective noun of relation, frequently passive, to the verb or root.  The meaning "of or pertaining to the sense of touch" is attested from the 1650s.  Tactile is an adjective, tactilize is a verb, tactility is a noun and tactilely is an adverb; the noun plural is tactilities.  In specialized use, the word “tactile” is an element in many words:

Audiotactile: (relating to the senses of hearing and touch).

Chemotactile: (the ability of an organism to sense changes to its chemical environment).

Electrotactile: (composed of an array of small electrodes that provide stimulation to the skin).

Entactogen: (the quality of combining mechanosensory (of or pertaining to the sensing of mechanical stimuli) with tactility).

Mechanotactile: (mechanosensory (of or pertaining to the sensing of mechanical stimuli) and tactile).

Orotactile: (of or pertaining to the sense of touch in mouth).

Pedotactile: (that can be felt by the feet).

Pneumotactile: (relating to the skin's ability to feel a pneumatic pulse).

Protactile: (a dialect of ALS (American Sign Language) that communicates with touch).

Tactilometry: (The measurement of touch or of vibration (change in dimension) (tactilometric the adjective).

Teletactile: (relating to the transmission of physical touch over a telecommunication network (teletactility the noun).

Thermotactile: (Sensitive to heat and to touch (but distinct from thermomreactive)).

Visuotactile: (relating to perception by vision and touch).

Vibrotactile: (of, pertaining to, or using vibrotaction (the dynamic response of tactile nerve endings in the skin to vibration)).

Tactile Paving

Examples of tactile pavers.

Tactile graphics (the singular form does exist but is rare and restricted to technical use (software manuals and such)) are raised-surface representations of images, maps, graphs and diagrams designed for individuals who are blind or visually impaired, enabling them to explore (using touch) anything able to be represented thus (physical topography, complex STEM (science, technology, engineering, math) content (cabling diagrams the classic example) spatial layouts, art etc).  Tactile paving was a practical application of tactile graphics, describing a system of textured ground surface indicators (constructed typically using a brightly colored rubberized plastic) permanently affixed to stairs, railway station platforms, the point at which a sidewalk (footpath) ends (the so-called “curb-cut”) and access to a pedestrian road-crossing begins etc.  The concept first appeared in Japan in the mid-1960s and was based on 点字ブロック (tenji (the name for Japanese braille, a system of writing in which letters and some combinations of letters are represented by raised dots arranged in three or four rows of two dots each and are read by the blind and partially sighted using the fingertips; the system was named after French educator Louis Braille (1809–1852))).  Something like “braille writ large” the “tactile paving tiles” are there as a kind of “signage” for the blind or visually-impaired, designed specifically easily to be detectable by shod-feet or a hand-held cane; the system was a major contribution to making the built environment more easily negotiable.  Although the shapes (“blister”, “lozenge”, “ribbed”, “cycleway”, “directional”, “stair” etc) are not quite internationally standardized, within jurisdictions, there is one for railway platforms, one for stairs, one for curb-cuts etc, the latter of importance because there’s sometimes no grade-change between a sidewalk and roadway along which motorized vehicles pass.

Tactile Necrophilia

Forensic and Medico-legal Aspects of Sexual Crimes and Unusual Sexual Practices (2008) by Professor Anil Aggrawal.

In psychiatry, “tactile necrophilia” (a condition in which subjects sexually are aroused by touching or stroking a corpse, without engaging in intercourse) is one of the ten classifications of necrophilia defined by Indian forensic psychologist Professor Anil Aggrawal (b 1956), author of the 438 page Forensic and Medico-legal Aspects of Sexual Crimes and Unusual Sexual Practices (2008), described in a review published in the AAJFC (American Academy Journal of Forensic Sciences) as a “quite remarkable book” and an “authoritative text” in which “Dr Aggrawal deftly brings to bear his 25 years of interest and knowledge of sexual deviancy”.  Within the profession, Dr Aggrawal is considered the leading authority on necrophilia and, as well as being a text book for the profession, Forensic and Medico-legal Aspects of Sexual Crimes and Unusual Sexual Practices is also a valuable contribution to the evolution of the history of how “normal” & “abnormal” have at various times been constructed, one reviewer noting “a enjoyable aspect of this book is Dr Aggrawal’s grasp of ancient references concerning the paraphilias in both religious and historical texts” while another was pleased by the inclusion of “minor aberrant behavior such as coprolalia and troilism.”

The ten classifications are not listed in either the APA’s (American Psychiatric Association) DSM (Diagnostic and Statistical Manual of Mental Disorders) nor the WHO’s (World Health Organization) ICD (International Classification of Diseases), and in the latest edition of the DSM (DSM-5-TR, 2022), a recurrent, intense sexual interest in corpses is classified as diagnosable under “Other Specified Paraphilic Disorder (necrophilia)” when “the cause of marked distress or impairment in important areas of functioning.”  Intriguingly, Professor Aggrawal list his ten headings in order of “increasing severity” meaning an “Exclusive Necrophiliac” (Class X; Those for whom sex with a corpse is an exclusive interest (ie they do not respond to a living partner)) is defined as a more severe condition than that of the “Homicidal Necrophiliac” (Class IX; Necrosadists, those who commit murder in order to have sex with the victim).  Presumably the notion of “severity” explored by Professor Aggrawal is based on a scale where the “total exclusion” of sex with a living human is the “terminal state” and one can see his point but it’s suspected most non-clinicians would regard (certainly on public policy grounds) someone who murders their sexual partners to be a “more severe” state of mental disorder than one who enjoys partners who met their end by other means (acts of God, trauma, murdered by the Freemasons, fatal illness etc).  Still, Professor Aggrawal is thought the world’s “leading authority on necrophilia” so we should defer to his expertise; it should be added his ten categories are to be digested while remembering he is a practicing forensic psychologist, his findings empirical and not theoretical:

Class I: Role players (Those aroused when pretending their partner is dead during sexual activity).

Class II: Romantic necrophiliacs (The bereaved people who remain attached to their dead lover's body).

Class III: Necrophiliac fantasizers (Those who fantasize about necrophilia, but do not physically interact with corpses).

Class IV: Tactile necrophiliacs (Those aroused by touching or stroking a corpse, without engaging in intercourse.

Class V: Fetishistic necrophiliacs (Those who remove objects or body parts from a corpse for sexual fetishes, without engaging in intercourse).

Class VI: Necromutilomaniacs (Those who derive pleasure from mutilating a corpse while masturbating, without engaging in intercourse).

Class VII: Opportunistic necrophiliacs (Those who usually have no interest in necrophilia but avail themselves of the opportunity when presented).

Class VIII: Regular necrophiliacs (Those who preferentially (but not exclusively) have intercourse with the dead).

Class IX: Homicidal necrophiliacs (Necrosadists; those who murder someone to have sex with the victim).

Class X: Exclusive necrophiliacs (Those for whom sex with a corpse is an exclusive interest (ie they do not respond to a living partner)).

Tactility's finest hour: The IBM Model M keyboard.

A triumph of modern industrial design but, in a way, a work of art: 1992 IBM (Blue Label) Model M keyboard.

In the few decades computing has been a mainstream activity, in the layers, at various points, such as been the variety of hardware, operating systems, languages and software, often there's been no general agreement about what’s best in any particular field but most with any exposure to the IBM Model M keyboard agree it’s probably the finest keyboard ever.  Even those not attracted to the tactility that is its most obvious characteristic (and there are those gentle souls who prefer a “squishy” to a “clicky” keyboard) will usually concede the build quality is exceptional, compared especially to some of the flimsy devices in recent years bundled with systems.  It shouldn’t be surprising IBM was able at scale to build something like the Model M keyboard given the company’s decades of experience in engineering such constructions and there are Model M nerds prepared to believe all those years were but preparation for what was required to make the Model M a landmark in tactility.

1973 IBM Selectric with three elements (golfballs).  The striking red was quite rare, staid corporations preferring blue, green and beige. 

IBM (International Business Machines) began in New York in 1888 (adopting the initialism in 1924), its early core-business mechanical “tabulating systems” for accounting and time-keeping and, by the 1930s, some of the mechanical engineering used in these systems was applied to typewriter technology after it acquired the tools, patents and production facilities of Electromatic Typewriters of Rochester.  The first result of an intense R&D (research & development) effort was released in 1935 as the Model 01 IBM Electric Typewriter, the machine that became the first really successful electric typewriter in the US and the beginning of a line which, by 1961, had evolved into the IBM Selectric, famous for its “element” that the rest of the world came to call the “golfball”.  The almost spherical “golfball” (it appears also in some IBM documents as “typeball”) contained the impressions of the letters that struck the ribbon and was interchangeable with others using different font sets.  That was not a new idea, other manufacturers using the principle of interchangeability in the late nineteenth century but with “type wheels” that were larger and tended to be fragile; the three-dimensional “golfball” was both more robust and, having to travel a smaller distance per key stroke, permitting a faster typing rate.  It was with the Selectric the evolution of what became the Model M keyboard really began.

1984 IBM Model F keyboard; the IBM mouse of the era was as ghastly to use as the look suggests.

Though the unit on the 1935 Model 01 Typewriter may be thought the Model M's LCA (last common ancestor), it's the Model F that deserves the honor of parenthood.  The first version of the definitively tactile, stand-alone IBM keyboard was the Model 14 which, although most associated with the original IBM PC-1 released in August 1981, had actually debuted with the System/23 Datamaster (1981-1985), a short-lived corporate workstation that proved a dinosaur, unable to adapt to the strange new world created by the unexpected success of the PC-1 (those in the IBM boardroom as surprised as any).  The adoption by corporations and SMBs (small & medium business) of the PC-1 and its successors was also ultimately the death knell for the earlier 6580 Displaywriter (1980-1986), a hefty and expensive dedicated word-processor (the impact printer usually bundled with the thing so loud most put it in an insulated shroud or a separate room); like the System/23 in the battle of "survival of the fittest", it proved unable to adapt, crowded out of the ecosystem by the rapidly expanding niche created by the PC-1.  In an era when "to be first" was often a great marketplace advantage (enabling critical mass to be gained), the Datamaster's introduction five weeks ahead of the PC-1 wasn't enough for the species to survive although it's Model 14 keyboard was shared with the upstart from which not much had been expected.  The Model 14 debuted with an 83 key layout and the nerdiest of nerds still extol its technical superiority over the Model M in that it uses a buckling spring over a capacitive PCB (printed circuit board) rather than the later membrane.  The Model F remained in production until 1985 (although volumes (by both IBM and Lexmark) had slowed) but it was the platform for innovations such as the revised layout to accommodate the PC-AT's protocols and the availability of specialized models with provision for magnetic stripe readers & inbuilt LCD readouts (both with cable-interfaces to external devices) and as few as 50 or as many as 127 keys (the latter industry-specific).

Custom IBM Model F keyboard with LED module.

Model F aficionados can be a snobby crowd, proud of pointing out even IBM admitted one of the design objectives with the Model M was to reduce manufacturing costs but the attraction is real, the intricacies of the Model F intriguing and their labour-intensive production process does mean nothing like them is likely again to be made.  The internal assembly uses two curved metal back-plates and the PCB is flexible, thus also curved when attached to the back-plate and while just about every other keyboard's curves are simulated by the molding of the keycap profiles, the Model F's curves were integral to the frame, thus allowing all keycaps to be the same shape and size, a great advantage for those who like to tinker and customize.  While freaks customizing keyboards are less frequently found than once they were, they exist still in dark rooms living on pizza and Coca-Cola.  Snobbery or not, the freaks do (up to a point) have a point because the mechanical advantages are real.  The capacitive design is superior, requiring a lighter actuation force, delivering a crisper feel and slightly sharper feedback; it’s also more robust, IBM guaranteeing each key with a MTBF (mean time between failure) of over 100 million key-presses, a reasonable life even for the most productive trolls.  The switch from PCBs to membranes meant these characteristics were to some degree toned down in order to lower manufacturing costs although the MTBF was still rated an impressive 80 million, even a Marcel Proust (1871-1922) unlikely to have worn one out in his lifetime.

IBM user Lindsay Lohan in Life-Size (2000, Walt Disney Television).

Pace the freaks but the Model M is preferable, if for no other reason than simply because it (more-or-less) standardized the core keyboard layout (most others have long conformed) and in use, the tactility is little different from its predecessor.  Regarding the layout, the case can be made that the Model F’s location of the function keys to the left may have made sense but the planet has settled on the Model M's layout and humans adapted.  Introduced in 1985 with the 3161 terminal, the PC-compatible version appeared in 1987 when it was included with the PS/2 range introduced with the OS/2 operating system and MCA (Micro Channel Architecture) bus.  The Model M is a solid (9 lb (4 kg)) tactile experience that feels as solid (and "clicky") as the Model F and users typically have a long time to become accustomed to that feel; the keyboards, some now over 40 years old, appearing not to have a life expectancy, many in continuous use for decades and a servicing ecosystem exists should any parts need to be replaced although it’s said rectifying the consequences of spills (of coffee, red wine, G&Ts etc) is a more common request and, as a general principle, the higher a liquid's sugar content, the more difficult the task.  Black tea or coffee with no sugar is, for many reasons, recommended, keyboard hygiene included.  The best source for the tactile status symbols is ClickyKeyboards.

United States Patent # 4,118,611 Buckling Spring torsional snap actuator. Harris, 1978:

It will be appreciated with regard to the figures that depression of the key button 1 moves the key button and its stem 6 into the housing 3, creating longitudinal compression and lateral deflection of the helical compression spring 2. An initial counter-clockwise moment is exerted on the rocker member 4 which is approximately equal to the force F times the distance between the pivot point 8 of the rocking member 4 and the center line of the spring. The upper end of the helical spring 2 is held squarely against the key button 1 by a clockwise moment created by a force equal to approximately F times the diameter of the spring divided by two. The rocker member 4 will initially be held firmly over the contacts 5A and 5B. As the lateral motion of the center of the helical compression spring 2 increases, both the top and bottom reaction moments in spring 2 are decreased because F is transmitted through the center section of spring 2. Shortly after these moments approach 0, the rocker member rocks to a position squarely over contacts 5A and 5C and the top of spring 2 rocks about the right hand edge of its topmost coil. The constraints upon the depression column spring have changed from an initial end clamped condition to an end clamped-pinned condition. This sudden change provides the tactile response of the key and is accompanied by a sudden rocking action of the rocker member 4 which creates an acoustic feedback as well.

Evolution of the IBM Keyboard layout: Model M, 3161 Terminal (1985) & PS/2 (1987) (top), Model F, PC-AT (1984) (centre) and Model F, PC & XT, (1981) (bottom).

The "buckling spring torsional snap actuator" is the core of the Model M’s charm.  Unlike mechanical switches that are depressed straight down like plungers, the Model M has springs under each key that contract, snap flat, or "buckle," and then spring back into place when released.  This provides the audible “click” so associated with the model and which some don’t like but for those who become accustomed to typing on one, it’s hard to go back to anything else; they have the feel of a pre-modern (circa 1980 and earlier) Mercedes-Benz.  Because of the physicality, typing on a Model M is a tangible experience; like a typewriter, the tactility and the feedback of the click gives every letter a physical presence.

NASA's (National Aeronautics and Space Administration) LSLF (Lunar Sample Laboratory Facility).

The LSLF is NASA's repository and laboratory facility at the Lyndon B. Johnson Space Center in Houston (named after Lyndon Johnson (LBJ, 1908–1973; VPOTUS 1961-1963 and POTUS 1963-1969 who, as VPOTUS was made titular head of the US space programme, the centrepiece of which was the Apollo project that produced the manned landing on the Moon in July 1969).  Since 1979, the LSLF has housed geologic samples collected from the lunar surface during the Apollo missions (1969-1972).  The facility preserves in a secure vault much of the 842 lb (382 kg) of rocks, dust and such returned to Earth as well as some other material and the associated data records.  The facility also contains "clean-room" laboratories so samples can be processed and studied in a contamination-free environment.

A "NASA office", circa 1989 (given the likely specification of the PC, probably not an engineer's desk), the Model M keyboard doubtlessly still functioning perfectly, the keys as tactile as the day it was built.  The "Luna Trash" bin is a nice piece of nerd humor. 

The LSLF also includes (as a "static exhibit", left), a replica of a room in the Space Center as it was in the late 1980s.  On the desk is Model M keyboard connected to a IBM PS/2 PC that, on the basis of the cropped image, appears to be a Model 30, a "low end" version that would have included either an 8086 (16-bit with 8-bit bus connectivity) or 80286 (16/16) CPU (central processing unit) and in either case would have been built on the AT (Advanced Technology) bus, later known as ISA (Industry Standard Architecture).  Higher end models included the 80386 (32/32 bit) CPU and MCA (Micro Channel Architecture, an early implementation of PnP (plug & play)), some even with the new OS/2 operating system.  For a number of reasons (technological and economic), MCA and OS/2 proved chimeric although OS/2 did become a fabulous beast, lasting in its niche into the twenty-first century and hobbyists still support development on the platform.  The LSLF's PS/2 may be running IBM PC-DOS 4.01, a "bug-fix" of the prematurely-released v4.0 that shipped with "bugs" in the handling of the then novel EMS (Expanded Memory Specification) on non-IBM expansion boards; memory was in the 1980s of great interest as users needed ways to "work-around" DOS's by the infamous 640 kb "addressable limit".  Microsoft "bug-fixed" v4.0 and this was released by IBM as PC-DOS 4.01; while MS-DOS 4.0 was always the "debugged" version, very few copies were shipped so numbered, a "cosmetic release" as 4.01 soon in the channel because of the reputation of v4.0 as "flawed".  Despite that, there's nothing to suggest pristine copies (ie still in shrink-wrap) of MS-DOS 4.0 have become even a minor collector's item.

Luna rock samples for touch in the LSLF.

Also in the LSLF is a display of the world's only eight lunar rocks (some nearly four billion years old), able to be touched by visitors.  Actually, as anyone at NASA cheerfully would admit, that exercise in lunar tactility may be a more common experience than advertised because there are many “Moon rocks” (and much dust) on or under the Earth’s surface; what distinguishes those on display in the LSLF is they are “certified” as having travelled here in the care of an Apollo craft’s astronauts.  Lacking a protective atmosphere, as the many craters testify, the Moon has been hit by many objects, the larger with such energy that fragments of lunar material have been ejected at a speed sufficient to exceed the “escape velocity” imposed by gravity (less than 2.5 km/s); Earth being the Moon’s near neighbour, some of those fragments travelled on an Earth-crossing trajectory and have fallen to the surface as lunar meteorites.  This process is ongoing and many have been identified, especially in Antarctica and desert regions where they’re relatively easy to recognise; chemically and isotopically they carry markers and these distinctive characteristics can be compared with the Apollo and other Luna samples.  Geologists note that of the volume of the stuff on Earth, much will never be identified because (1) so much lands (as we say) in the oceans (some 70% of our planet’s surface), (2) some will be buried deep, (3) processes over time will have incorporated much into Earth's geological cycle to the point the material visually is indistinguishable visually from terrestrial rocks and (4) some material may over millions or billions of years have been weathered into dust or metamorphosed.  What does however distinguish what’s on display to touch at the LSLF is “guaranteed purity”, the lunar material ending up “naturally” on Earth in a sense “infected” by “local contamination”.