Borderline

Borderline (pronounced bawr-der-lahyn)

(1) On or near a border or boundary; a border; dividing line; line of demarcation.

(2) Uncertain; indeterminate; debatable; an indeterminate position between two conditions.

(3) Not quite meeting accepted, expected, or average standards.

(4) In psychiatry, as Borderline Personality Disorder, a descriptor of a personality disorder characterized by instability in many areas, as mood, identity, self-image and behavior and often manifested by impulsive actions, suicide attempts, inappropriate anger, or depression. The abbreviation is BPD.

1847: A compound word (also as border-line), created to describe a "strip of land along a frontier" as distinct from the actual line of a border, the construct being border + line.  Border was inherited from the Middle English bordure, from the Old French bordure & bordeure, from border (to border), from bort & bord (a border), of Germanic origin akin and to the Middle High German borte (border, trim) and the German Borte (ribbon, trimming); doublet of bordure.  Line, influenced in Middle English by the Middle French ligne (line), was from the Latin linea, from līneus (flaxen; a flaxen thing) from līnum (flax).  The Middle French ligne was from the Old Danish likna, derived with the inchoative suffix -ne from lig (similar) and was related to the Swedish likna, the English liken and the Middle Low German līkenen.  It replaced galīkōną, an older verb without -n, hence the Old English ġelīcian, the German gleichen and the Gothic galeikōn.  As an adjective meaning "verging on" it is attested from 1903, originally in medical jargon to describe various conditions but from the 1930s, it became most associated with metal health, the diagnosis of the condition BPD (Borderline Personality Disorder) apparently first mentioned in the medical literature in 1938 and evolving over several decades.  More correctly, that process can be called a "co-evolution" because while in academic and clinical use understanding of the condition was being refined, in the popular imagination BPD became one of the more popular terms used both for self-diagnosis and to apply to others (whether or not known personally).  Because BPD is inherently a spectrum condition, coinings like borderlinelike & borderlineish are superfluous although (of behavior) borderlinesque might be useful; all three remain non-standard.  The adjective nonborderline is used both in political geography (those lines of delineation on maps indicating something other than national or sub-national borders) and mental health (meaning “unaffected by BPD”).  Borderline is a noun, verb, adjective & adverb, borderliner & borderlineness are nouns and borderlined & borderlining are verbs; the noun plural is borderlines.  

Borderline Personality Disorder

On the internet, BPD is one of the more popular of the conditions ascribed to celebrities, politicians and others in the public eye.  As a general principle, places on the web are not recommended as sources of medical advice and that includes mental health although it seems obvious that in many politicians, their personality disorders are well beyond being classified as "borderline", many thresholds long since crossed.

In clinical psychiatry, although the number of borderline conditions has increased, it’s only the concepts of Borderline Personality Disorder (BPD) and the Schizotypal Personality which are claimed to have adequate diagnostic reliability, the parameters of both first codified in the third edition of the American Psychiatric Association's (APA) Diagnostic and Statistical Manual of Mental Disorders (DSM).  The fourth edition (DSM-IV-TR (2000)), established the most commonly followed criteria for BPD and in DSM-5 (2013), these were extended to a remarkable sixteen headings in seven (A-G) categories in what appeared to be a kind of clinical mopping-up of symptoms suffered by those not able, for whatever reason, to be diagnosed with something more specific.  Indeed, the all-encompassing taxonomy appears rendered superfluous by Criterion E which seems just about to sum it up.

Criterion A: Moderate or greater impairment in personality functioning; two or more of the following criteria: (1) Identity: Markedly impoverished, poorly developed, or unstable self-image, often associated with excessive self-criticism; chronic feelings of emptiness; dissociative states under stress. (2) Self-direction: Instability in goals, aspirations, values, or career plans. (3) Empathy: Compromised ability to recognize the feelings and needs of others associated with interpersonal hypersensitivity (i.e., prone to feel slighted or insulted); perceptions of others selectively biased toward negative attributes or vulnerabilities. (4) Intimacy: Intense, unstable, and conflicted close relationships, marked by mistrust, neediness, and anxious preoccupation with real or imagined abandonment; close relationships often viewed in extremes of idealization and devaluation and alternating between over-involvement and withdrawal.

Criterion B: Four or more of the following seven pathological personality traits must be present: (5) Emotional liability: Unstable emotional experiences and frequent mood changes; emotions that are easily aroused, intense, and/or out of proportion to events and circumstances. (6) Anxiousness: Intense feelings of nervousness, tenseness, or panic, often in reaction to interpersonal stresses; worry about the negative effects of past unpleasant experiences and future negative possibilities; feeling fearful, apprehensive, or threatened by uncertainty; fears of falling apart or losing control. (7) Separation insecurity: Fears of rejection by and/or separation from significant others, associated with fears of excessive dependency and complete loss of autonomy. (8) Depressivity: Frequent feelings of being down, miserable, and/or hopeless; difficulty recovering from such moods; pessimism about the future; pervasive shame; feelings of inferior self-worth; thoughts of suicide and suicidal behavior. (9) Impulsivity: Acting on the spur of the moment in response to immediate stimuli; acting on a momentary basis without a plan or consideration of outcomes; difficulty establishing or following plans; a sense of urgency and self-harming behavior under emotional distress. (10) Risk-taking: Engagement in dangerous, risky, and potentially self-damaging activities, unnecessarily and without regard to consequences; lack of concern for one’s limitations and denial of the reality of the personal danger. (11) Hostility: Persistent or frequent angry feelings; anger or irritability in response to minor slights and insults.

Criterion C: (12) The impairments in personality functioning and the individual’s personality trait expression are relatively inflexible and pervasive across a broad range of personal and social situations.

Criterion D: (13) The impairments in personality functioning and the individual’s personality trait expression are relatively stable across time with onsets that can be traced back at least to adolescence or early adulthood.

Criterion E: (14) The impairments in personality functioning and the individual’s personality trait expression are not better explained by another mental disorder.

Criterion F: (15) The impairments in personality functioning and the individual’s personality trait expression are not attributable to a substance (eg, a drug of abuse, medication, exposure to a toxin) or a general medical condition (eg, severe head trauma).

Criterion G: (16) The impairments in personality functioning and the individual’s personality trait expression are not better understood as normal for the individual’s developmental stage or the socio-cultural environment.

The wide BPD net cast in DSM-5 pleased the psychiatrists but in recent years, there’s been interest in changing the name of BPD, a movement led not the profession but by those diagnosed with the condition, the creation of pressure-groups now greatly assisted by social media.  The objections seem to be that BPD (1) somehow marginalizes the sufferers in the hierarchy of mental illness, (2) fails to capture the underlying issues and mechanisms involved in producing its symptoms and (3), denigrates and even invalidates the very existence of their condition, the word “borderline” suggesting their symptoms aren’t sufficiently severe to be a “real” condition.  In that sense, the word does have loaded connotations, “borderline” used first by 1930s psychoanalysts to describe patients whose symptoms lay between psychosis and neurosis but to modern lay-persons, a common interpretation is that the condition “borders” on being a “real” illness.  Some even object to “disorder” but most accept it; they’d just prefer to be diagnosed with a more significant, and fashionable, depressive disorder.

Although it seems hardly more respectable, Emotional Intensity Disorder emerged from a survey as the popular choice of patients, beating out Emotional Regulation Disorder, Emotional Dysregulation Disorder, Emotionally Unstable Personality Disorder, Impulsive Personality Disorder & Impulsive-Emotional Dysregulation Disorder.  The clinicians liked Emotional Regulation Disorder but were out-voted.  Unimpressed by either, the committee working on the revision of DSM-5 proposed Borderline Type (which sounds like a sceptical psychiatrist’s casual dismissal of emos), but noted “no decision has yet been made.”  When in 2022 the text-revision (DSM-5-TR) was released, although there were textual and contextual updates, the diagnostic criteria for BPD did not change so the distinction between the two can be thought terminological rather than structural, the language used reflected the editors’ decades-long attempts at once to be more precise and less stigmatizing.  In DSM-5-TR there was also an obvious focus on editing “now suspect” references to gender but none of this altered the construct of BPD.  As had long been the practice, DSM-5-TR included updated epidemiology data (if newer research or analysis was thought to have provided some refinement) but it was very much a project focused on cultural considerations, terminology and “modernization” of language.

Checkpoint Charlie and the Berlin borderline, 1961-1990

Konrad Adenauer (1876–1967; FRG Chancellor 1949-1963) at Checkpoint Charlie in 1962; car is a Mercedes-Benz 300d (W189).

The 300 was produced in four generations (W186: 300, 300b & 300c, 1951-1957 & W189: 300d, 1957-1962) and became known informally as the “300 Adenauer”, the association prompted by the chancellor using six (cabriolets, sedans and a landaulet) 300s during his long term in office.  The 300d is also associated with John XXIII (1881–1963; pope 1958-1963) who was presented with one in 1960 and it served as the official papal vehicle until 1965 when Paul VI (1897-1978; pope 1963-1978) took delivery of a Mercedes-Benz 600; both cars were high-roofed landaulets.  Used only until the mid-1960s, the lower case characters in the model designation appeared only in documents and were never added to the badgework but they are another layer in the intricacy of the factory's model nomenclature which, when first conceived (sort of) made sense but a combination of new technology and range-proliferation (with the same engines appearing in different classes conspired to make the system unmanageable and in the early 1990s there was a structural revision which, as amended (with its own inconsistencies), endures to this day.

Although the most famous, the crossing point in the Berlin Wall (1961-1989) on the borderline between East and West Berlin and named Checkpoint Charlie (Checkpoint C to the military) was one of three, all known by their designation drawn from the NATO phonetic alphabet, the now forgotten pair being Checkpoint Alpha at Helmstedt and Checkpoint Bravo at Wannsee.  The Soviets (officially) didn't use the NATO designation, instead calling Checkpoint Charlie the КПП Фридрихштрассе (KPP Fridrikhshtrasse (Friedrichstraße Crossing Point)) while the government of the GDR (Deutsche Demokratische Republik (German Democratic Republic; the old East Germany, 1949-1990) listed it as the Grenzübergangsstelle (Border Crossing Point) Friedrich-Zimmerstraße.

Checkpoint Charlie, 1963.

In one of the charming coincidences of the Cold War, Checkpoint Charlie was located at the intersection of Friedrichstraße, Zimmerstraße & Mauerstraße (Wall Street).  It became the only well-know crossing point because, for reasons of security and administrative convenience, it was the sole designated crossing point (whether for foot or vehicular traffic) for foreigners and members of the three Allied (previously occupying) forces (France, the UK & the US) stationed in the FRG (Bundesrepublik Deutschland (Federal Republic of Germany; the old West Germany, 1949-1990).  The manned structures associated with Checkpoint Charlie were also in a location which lent itself to photography from a number of angles and replicas were built by film studios for the many productions shot in Berlin during the Cold War.  Often dark, gloomy pieces, the "Cold War spy film" was a genre which over the decades as geopolitical tensions waxed & waned but the divided Berlin of the 1960s was its high-point and what was done then "defined the look".  The Cafe Adler (Eagle Café), adjacent to Checkpoint Charlie was for decades one of West Berlin's tourist hotspots.

Checkpoint Charlie in 1982, showing the larger aluminum building which that year replaced the original wooden hut.

To those accustomed to seeing the gargantuan structures the US military tend to erect wherever they take root, Checkpoint Charlie must have been a surprise, a modest (though enlarged in 1962) and obviously temporary wooden hut was for more than twenty years all that stood on the western side, the little building replaced in 1982 only because it had become so dilapidated it was literally falling down around the guards stationed within and even then, the metal structure which replaced it, while larger, was no more permanent.  That obvious impermanence was part of the political messaging, the Western powers never wishing to hint at an acceptance the division of Germany would forever endure.  However, if people were surprised, it’s doubtful many were disappointed, the compact architecture providing a single point of focus and even in the pre-selfie era, at one glance, what tourists could take in was evocative of the Cold War cinema with which so many were familiar.

Checkpoint Charlie, 1970.

The attitude of the allied powers reflected their political position that while obviously a line of control, the Berlin Wall was not a legitimate international borderline and thus only small, temporary buildings were required.  To the authorities in the Kremlin and the GDR, whatever some might suggest was the position in international law, the Berlin Wall was a borderline and thus on their side the infrastructure quickly grew to include watchtowers, a military barracks and a multi-lane, enclosed clearing zone in which those wishing to cross could be interrogated and searched.

Checkpoint Charlie in 2020, now a replica “1961” hut with new sandbags.

The Berlin Wall “fell” in November 1989 and the checkpoint booth was removed some six months later although, because East and West Germany remained legally separate countries, the checkpoint at the point of the borderline was retained as the designated official crossing-point for foreigners and diplomats, an arrangement which ended in October 1990 when German reunification was formalized in law.  Checkpoint Charlie has since remained one of Berlin's tourist attractions and, just as some parts of the once demolished wall have been re-created because supply of the real thing wasn’t enough to meet demand, the municipal government soon erected an almost exact replica of the checkpoint as it stood in 1961 although the quality of the construction is said to be rather more robust than the original and it’s expected to enjoy a longer life.  Better to capture the flavor, even the sandbags which gradually were removed during the 1970s are back in place, carefully stacked.  During every week of the tourist season, selfies are taken by the thousand.

Sanpaku

Sanpaku (pronounced san-pach-ew)

An eye in which the sclera (white of the eye) is visible on three sides of the iris rather than the usual two (left & right).

Pre 1700s: A borrowing from the Japanese 三白 (sanpaku) (three whites) or 三白眼 (sanpaku gan) (three-white eyes).  Sanpaku is a noun and sanpakuish is an adjective; the noun plural is sanpakus.

Sanpaku (三白) (three whites) & Sanpaku gan (三白眼) (three-white eyes) are Japanese terms from traditional Chinese & Japanese medicine and they describe the “condition” in which the white of the eye is visible either above or below the iris when looking straight ahead.  Although the word was popularized by Japanese educator and nutritionist Nyoichi “George” Ohsawa (1893–1966) when he published the book You Are All Sanpaku in 1965, the idea had existed in oriental medicine probably for centuries although it’s impossible accurately to determine its origin.  It was mentioned in the diaries of at least one nineteenth century US Navy physician but attracted no interest in the West until the release of Ohsawa san’s book.  In Western medicine the phenomenon is described as “lower scleral show” or “inferior scleral show”, terms which are merely descriptive because (1) it’s something thought within the range of normality, (2) is indicative of no other mental or physical states and thus (3) is generally not considered a medical condition requiring treatment and is attributed variously to (3a) normal variation in eyelid anatomy, (3b) transient facial expression or gaze direction, (3c) traumatic injury or (3d) age-related tissue changes.  There are orbital or eyelid conditions (the best known being a thyroid-related eye disease causing lid retraction) which can induce a sanpaku-like appearance but instances are vanishingly rare.  In short, the medicalization of sanpaku is thought a product of superstition so predictably, on social media, sanpaku eyes seem to have a cult following.

Sydney Sweeney (b 1997) displaying her Sanpaku inferior (sclera (white of the eye) visible below the iris), Met Gala, Metropolitan Museum of Art, Manhattan, New York City, May 2025.  Lovely though her eyes are, it may be not many have long focused on them.

In You Are All Sanpaku, Ohsawa san described sanpaku as a condition which indicated physical and mental imbalances and discussed its significance in relation to diet and overall well-being.  Historically, sanpaku is believed to have entered oriental medicine from the Japanese practice of “face-reading” and those with eyes observed thus were considered ill-fated and destined for a life filled with misfortune, culminating often with an early demise.  It gained a following on social media by the usual means: celebrity association.  Diana, Princess of Wales, President John Kennedy & Marilyn Munroe, all of whom died young, were all sanpakus and as Ohsawa san warned in You Are All Sanpaku: the eyes indicate someone's fate, signifying imminent danger or an “early and tragic end.”

Diana, Princess of Wales (1961-1997, far left), Marilyn Monroe (1926–1962, centre left), Billie Eilish (b 2001. centre right) and John Kennedy (JFK, 1917–1963; POTUS 1961-1963, far right).  Three died young in tragic circumstances but Ms Eilish remains fit and well.

The original basis of “face reading” isn’t known but as a diagnostic tool it focused on the matter of “balance”, something important also to the physicians of Antiquity who identified the “four humors”: flegmat (phlegm), sanguin (blood), coleric (yellow bile) & melanc (black bile) which were the causative agents of the four personality types, the phlegmatic, the sanguine, the choleric & the melancholic.  In the East, signs of sanpaku meant a man’s whole system (physical, physiological and spiritual) was out of balance, something caused by sins committed against the order of the universe, accounting for his sickness, unhappiness or insanity.  Ohsawa san noted that in the West, such folk had come to be called “accident prone” and they were the ones who should take note of the warning from sanpaku, nature’s tap on the shoulder.  A practical author of self-help texts, Ohsawa san recommended sanpaku eyes should be treated with a macrobiotic diet, focusing on brown rice and soybeans, something on which he had real expertise as the founder of the macrobiotic diet.

By their sanpaku you shall know them: Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945, left), crooked Hillary Clinton (b 1947; US secretary of state 2009-2013, centre) and cult-leader Charles Manson (1934-2017, right).

Interestingly, the beliefs about sanpaku are culturally variable although universally it’s held the condition determines one's fate.  In the Japanese tradition those consequences are ill fate and misfortune while the Chinese associate sanpaku with good luck and wealth and this divergence has interested cultural anthropologists who study the symbolism and mythologies of different societies.  The tradition divides the eyes into "yin sanpaku" and "yang sanpaku", the roots of this the ancient Chinese concept of yin & yang, representing the duality of opposing yet complementary forces in the universe.  Yin and Yang are fundamental concepts in Chinese philosophy and represent complementary and interconnected aspects of the universe. Yin is associated with qualities such as darkness, femininity, passivity, and coldness, while Yang is associated with light, masculinity, activity, and warmth. They’re seen as opposing forces that are in a constant state of dynamic balance and they exist within all phenomena, including human physiology, nature and society.  In this they differ from the (wholly un-related) concept in particle physics of matter and anti-matter.  Matter is the familiar stuff which is much of the physical universe (particles such as protons, neutrons, and electrons) while anti-matter consists of particles with the same mass as their matter counterparts but carrying an opposite charges.  When matter and anti-matter particles come into contact, they can annihilate each other, releasing energy.  Ying and Yang, mutually dependent, live in peaceful co-existence.

The Mean Girls (2004) crew demonstrate the range:  Rachel McAdams (b 1978, far left) & Lindsay Lohan (b 1986, centre-left) are in the part of the population who are either not sanpakus or the effect is imperceptible.  Lacey Chabert (b 1982, centre-right) is in the group with a separation around 1 mm while Amanda Seyfried (b 1985, far right) displays up to 2 mm depending on her expression.

A quadrilateral meeting to discuss German war guilt reparations and allied debts accumulated during World War I (1914-1918): Raymond Poincaré (1860–1934; President of France 1913-1920, far left), Andrew Bonar Law (1858–1923; Prime Minister of the United Kingdom 1922-1923, centre-left), Benito Mussolini (1883-1945; Duce (leader) & Prime-Minister of Italy 1922-1943, centre right) and Georges Theunis (1873–1966; Prime Minister of Belgium 1921-1925 & 1934-1935, far right), 10 Downing Street, London, December 1922.

Before it became a meme, this was an obscure photograph which until the twenty-first century had appeared only in some specialist history texts but as the internet achieved critical mass, memes became a thing and Mussolini’s sanpaku eyes were a gift for the meme-makers, most captions suggesting the Duce may have had a sudden premonition of his own unfortunate end although others offered: “I feel naked without a moustache”, “I think I have imposter syndrome”, “Oh God, I just pooped my pants”, “I know one of these men is a Freemason but I don't know which” and “I wonder if they can tell I've smoked some weed”.  However, although not noted as a mystic, he may have sensed another's impending death, “sitteth at the right hand”, Andrew Bonar Law then having only months to live.

Princess Beatrice, Mrs Edoardo Mapelli Mozzi (b 1988).  Until she appeared at a royal wedding in the fascinator she made famous (some humorless souls would have said infamous), she was most noted for her lovely sanpaku eyes.

In Japanese face reading, yang sanpaku eyes (white part visible above the iris) reveal a person's dark and sinister nature, the eyes indicating the unstable mental state suffered by individuals exhibiting uncontrollable aggression, such as psychopathic murderers or serial killers.  Yin Sanpaku Eyes (sclera visible below the iris) signify a different physical or mental imbalance, one caused by the abuse of drugs, alcohol, and sugar which disrupt the body's equilibrium.  Although discouraged by all in the profession except the odd, entrepreneurial cosmetic surgeon, treatment options are available to “correct” scleral show and the most effect treatment is aesthetic plastic surgery, specifically the procedure called blepharoplasty, which can correct the appearance of the eyes.  The construct of blepharoplasty was blepharo- +‎ -plasty.  Blepharo- was from the New Latin, from the Ancient Greek βλέφαρον (blépharon) (eyelid; a feature resembling an eyelid) and -plasty was from the Ancient Greek πλαστός (plastós) (molded, formed) which now has the special meaning in medicine meaning "repair, restoration or re-shaping of part of the body with a surgical procedure".

Alexandria Ocasio-Cortez (AOC, b 1989, US Representative (Democrat-New York) since 2019 and one of "the squad") displaying her Sanpaku superior (sclera visible above the iris).  Some other of her body parts are also well-documented.

Casual observation suggests sanpaku eyes are far from rare and there are said to be three classes: (1) those with at least a .25 mm (.0098 inch) space between the iris and the upper and lower eyelids, (2) those with a separation of 1 (.0394 inch) mm and (3) those with a gap of 2 mm (.0787 inch) or more.  The concition need not manifest as something symmetrical (in the vertical axis), the two elements being (1) Sanpaku inferior: white visible below the iris and (2) Sanpaku superior: white visible above the iris, the latter said often induced when a subject is frightened or physiologically stressed).  However although “estimates” have been published, neither the prevalence of the condition nor the distribution within the three (unofficial) groups have ever been the subject of a reputable epidemiological study; because “sanpaku eyes” is not a recognised medical or anthropometric category; funding would thus be hard to secure although, as a purely observational and statistical exercise, presumably not many ethics departments would much be troubled.  So, lacking a defined diagnostic entry, there is no standardised measurement threshold and estimates of prevalence are thus almost certainly speculative and thus unreliable.  Those with sanpaku eyes should not too much dwell on the numbers and instead flutter their eyelashes and enjoy the admiring glances.

Mean Girls four-way phone call: Eye-rolls (Amanda Seyfried, top right) don't count, a sanpaku defined only by separation maintained when looking ahead or to the side.

Humans are not the only species with a sclera but we are untypical in it being so visible.  That humans even have white scleras has interested linguistic anthropologists, evolutionary biologists and other researchers, some offering the Cooperative Eye Hypothesis which suggested the distinctive appearance evolved as a mechanism with non-verbal communication could be enhanced.  According to this conjecture, the high visibility of the iris & pupil against the white background allows an interlocutor more easily to track eye movements, helping individuals to understand where others are looking during interactions.  Observational studies revealed the way humans and other great apes move their heads and eyes in different ways, humans relying more on eye movements than head movements to see where someone else is looking.  Apes, without the white component in their eyes, tend more to move the whole head.  Not all support the "cooperative eye" faction but it’s an interesting approach to understanding the evolutionary significance of the human eye's appearance and the sophistication of communication is certainly a noted difference between humans and apes.

Seeing the whites of the eye: a gree-eyed cormorant taking lunch.

The phrase “don’t shoot until you see the whites of their eyes” comes of the military and was an instruction to infantry in the age of the musket to delay firing until the target was within close range, the rationale being (1) accuracy would be enhanced and (2) the projectile (musket ball) would strike with greater energy, thus increasing the effectiveness (measured in the casualty & death rates).  It’s often attributed to Colonel William Prescott (1726–1795) shouting it to his troops at the Battle of Bunker Hill (1775) during the American Revolutionary War (1775-1783) but according to Phrase Finder, the origins lie at least 32 years earlier.  On 27 Jun, 1743, during the Battle of Dettingen (fought in Bavaria as one of the "footnote engagements" of the War of the Austrian Succession (1740-1748)), the resourceful Scot Lieutenant-Colonel (later Lieutenant General) Sir Andrew Agnew of Lochnaw (1867-1761) 5th Baronet) departed from military orthodoxy when, responding to a French cavalry charge, adopted a novel tactic he’d devised, keeping his men not in the conventional square formation to meet the charge head on but having the two centre companies divide from the centre, falling back from the outer markers, thereby compelling the French to gallop through a withering crossfire.  It was potentially a high-risk strategy but he’d trained his troops well the French cavalrymen obediently threaded the needle, suffering heavy losses.  Tacitly acknowledging the danger presented by his innovation, Sir Andrew’s succinct instruction to his brigade had been: “Dinna fire till ye can see the whites of their e' en . . . if ye dinna kill them they'll kill you.”

If the human eye lacked a white sclera it would mean the “messaging” in facial expressions (a non-verbal clue in communication) would have evolved a little differently; Paris Hilton (b 1981) illustrates (digitally altered image).  Ms Hilton has brown eyes but often wears blue contact lens.

As far as is known, all living creatures on Earth came ultimately from a single event which can be said to be the origin of life because at this time, there is no evidence of other living things anywhere in the universe.  Everything else is speculative; life may have started (or arrived) here many other times but for whatever reason not thrived and around the universe there may be many forms of life; some may be more advanced than us or we may be unique in our scientific and technological mastery.  The single point of origin is why we share elements of DNA (Deoxyribonucleic acid, the so-called “building-blocks of life”) with our cats, dogs, goldfish and bananas so, unsurprisingly, in living creatures, eyes are common, often in pairs but unlike those in humans, not all are out-growths of a brain although, in many of the lineages of the Metazoa they are neurally derived and remain tightly integrated with the central nervous system.

A nice pair of boobies.  Charmingly, blue-footed boobies are known to be monogamous, pairs often staying together for life.  Like us, birds are two eyed vertebrates although except for the old outlier (like owls) their eyes, for good reasons, shifted to the sides.  Note how the booby’s eye differs from that of a human.

As a general principle it all depended on the developmental origin and phylogeny (the evolutionary history of groups of organisms).  In vertebrates (mammals, birds, fish etc), the eye evolved as an evagination (a growth outward) of the forebrain during embryogenesis (the process by which an embryo is formed and develops).  Cephalopods (octopus, squid etc) differ in that while the optic lobes of the brain are large and closely connected, the eye is not literally a brain protrusion; thus, while neurally integrated, the eyes are not brain outgrowths.  Arthropods (insects, crustaceans and such) have compound eyes formed from ectodermal (of the The outermost of the three tissue layers in the embryo of a metazoan animal) tissues which connect to the brain via optic nerves and are thus also neurally connected but not developmental extensions of the brain itself.  Many cnidarians (such as the box jellyfish) possess complex lens eyes but lack a centralized brain, their eyes peripheral sensory structures connecting to nerve rings rather than a true brain.  Many invertebrates have relatively simple photoreceptors which can be thought of as “eyespots” which can be distributed across body tissues, the best contemporary comparison probably the sensors now so ubiquitous in electronic devices.

Boobies, one step at a time.

A booby is a seabird in the genus Sula, part of the Sulidae family.  Boobies are closely related to the gannets (Morus), which were formerly included in Sula, the genus created in 1760 by the French naturalist Mathurin Jacques Brisson (1723-1806).  The name was derived from súla, the Old Norse and Icelandic word for the other member of the family Sulidae, the gannet.  The English name booby was based on the Spanish bobo (stupid) as the tame birds often landed on board sailing ships, where they were easily captured and eaten.  As well as a popular addition to the diet of sailors for whom meat other than fish was a rarity, it was fortuitous for many, the Admiralty's archives revealing boobies often mentioned as having been caught and eaten by shipwrecked sailors.

Mr Andrew Mountbatten Windsor in police car, under arrest, February, 2026.

If humans had eyes free of a white sclera (like the booby and many birds), our appearance would be quite different, illustrated by a digitally edited image of (the former prince/duke/admiral etc) Andrew-Mountbatten Windsor (b 1960), rendered as a cartoon by Vovsoft.  However, the use of that image to demonstrate the point may not have been the best choice because, in the original, his expression didn’t appear greatly different.

As well as charming eyes, boobies also have interesting feet.  The distinctive blue feet (the result of pigments ingested from their diet of fish) also play a part in the bobby’s mating ritual although not exactly in the podophilic sense familiar in a sub-set of humans.  In the spring mating season, the bird’s feet become a bright turquoise blue and, to demonstrate their health and vitality, conspicuously they will display them to potential partners.  The job done, as their eggs hatch, the blue hue fades to something less vivid.  One aspect of their behaviour which amused the ornithologists who first observed it was that if among fishers unloading their catch, it tossed a small fish from the by-catch, a booby will take it and waddle off somewhere to enjoy it in solitude rather than gulping it down as in common in many species.  Like penguins, although ungainly on land, they are skilled plunge divers which used their streamlined bodies and air sacs “fly” through the water, catching their prey at high speed and they hunt in "packs", coordinating their movement to maximize the catch.  Boobies have been recorded diving from as high as 90 m (300 feet), their speed upon entry estimated at around 100 km/h (60 mph).

Naiad

Naiad (pronounced ney-ad, ney-uhd or nahy-ad)

(1) In Classical Mythology, a nymph (a female deity) dwelling in (in some stories “presiding over”) a lake, river, spring or fountain.

(2) In entomology, aquatic larva or juvenile form of the dragonfly, damselfly, mayfly and related insects.

(3) In botany, any monocotyledonous submerged aquatic plant of the genus Naias (or Najas), having narrow leaves and small flowers (of the family Naiadaceae (or Najadaceae) and also called the water nymph.

(4) In malacology, any of certain freshwater mussels of the genus Unio.

(5) In informal use, a female swimmer, especially a young, expert one.

Circa 1600: From the Latin Nais, Naias & Nāïad- (stem of Nāïas, genitive naiadis), from the Ancient Greek Nāïás (plural Naiades) (a water nymph) and related to νάω (náō or náein) (to flow), from the primitive Indo-European naw-yo-, a suffixed form of snau & nau- (to swim, flow, let flow (from the primitive Indo-European root sna- (to swim).  The English poet, literary critic, translator and playwright John Dryden (1631–1700) used the Latin singular form Nais; In English, the plural form Naiades was in use as early as the late fourteenth century and the use of the initial capital was inconsistent, something not unusual in Middle and early Modern English .  Naiad is a noun; the noun plural is naiads or naiades.

The companion term (in the sense they were often riparian (growing on the bank of a river or stream)) was dryad (a female tree spirit), from the Old French driade (wood nymph), from the Latin Dryas & Dryadis, from the Ancient Greek Δρυάς (Druás) (dryad), from δρῦς (drûs) (oak), from the primitive Indo-European derew & derewo- (tree, wood) and related to the primitive Indo-European dóru (tree).  The niads should not be confused with the Nereids (plural Nereids or Nereides).  In Greek Mythology, Nerids were one of 50 sea nymphs who were attendants upon Poseidon (Neptune); they were represented riding on sea horses, sometimes in human form and sometimes with the tail of a fish.  In zoology, nerid is an alternative form of nereidid (any polychaete worm of the Nereididae).  Nereid was from the stem of the Latin Nērēis (sea-nymph), from the Ancient Greek Νηρηΐς (Nērēḯs), from Νηρεύς (Nēreús) (the sea-god Nereus).

Fuchsia Water Nymph.

The Naiads were water nymphs who, although very long-lived, were mortal, a physiology not unique among the deities of Classical Mythology and although the Naiads incarnate the divinity of the spring or stream which they inhabited, a waterway could be the home to more than one of the nymphs; presence did not confer an exclusivity of dominion.  As is typical of the myths, the stories often are inconsistent for although Homer said the Naiads were the daughters of Zeus, elsewhere they’re described as daughters of the waters in which they dwell.  The daughters of Ασωπός (Asopus) were Naiads.  Asopus (Ασωπός) was the god of the river Asopus and (the family tree is typically murky and varies with the source) was either son of Poseidon & Pero, of Zeus & Eurynome or of Oceanus & Tethys.  He married Metope, the daughter of Ladon, fathered two sons (Ismenus and Pelagon) and an impressive 20 daughters although The Greek historian of the first century BC, Διόδωρος (Diodorus of Sicily) listed the names only of a dozen (Corcyra, Salamis, Aegina, Pirene, Cleone, Thebe, Tanagra, Thespia, Asopis, Sinope, Oenia (or Ornia) and Chalcis.  Confusingly Asopus is in other places mentioned as the said to be the father of Antiope and Plataea (that genealogy contested by other authors), after whom the city Plataea is named.  Plataea was a city-state in Boeotia at the foot of Mount Cithaeron, between the mountain and the river Asopus (which divided its territory from that of Thebes).  The modern Greek town of Plataies is adjacent to its ruins.

Led astray by freshwater sirens: Hylas and the Nymphs (1896), oil on canvas by the aptly named John William Waterhouse (1849–1917), Manchester Art Gallery, England.  Ύλας (Hylas) would not long live to enjoy his flirtation with a pack of Naiads.  Much taken by his beauty, the naiads lured the youth to the water for their pleasure, after which, according to the Roman Poet Ovid (Publius Ovidius Naso; 43 BC–17 AD), they drowned him; at the least, that suggests ingratitude.  Hylas may have died content but that's not something on which Ovid dwelt.

In theory, there shouldn't be a river or spring without at least one naiad but the storied ones were those associated with famous waterways and many of the nymphs had adventures (not always welcome) with the good, great and ghastly.  At Syracuse dwelt the beautiful Αρέθουσα (Arethusa; all nymphs were beauties but Arethusa was a supermodel among the breed), a companion of Αρτεμις (Artemis) who was identified by the Romans with Diana.  Some said she was the daughter of Demeter, but in most stories she was the twin sister of Apollo, their parents being Zeus and Leto.  One day, while swimming in the river (something which, unsurprisingly, the Naiads often did), Arethusa realized she wasn’t alone when she heard the voice of Alpheus, the god of the river, whose crush on her had developed into a passion which included stalking her.  Pursued by the lustful god, the nymph fled, crying out for Artemis to save her from what she knew would be an awful fate.  Artemis surrounded her in a concealing fog but Alpheus refused to leave the place where the mist swirled and in fright, Arethusa turned into a fountain.  In the way the myths handle the physics of such circumstances, the earth opened up to prevent Alpheus mingling his own waters with those of the spring which Arethusa had become, and, guided by Artemis, Arethusa went through underground channels to Syracuse, on the Island of Ortygia (which is dedicated to Artemis).  This Hellenistic myth is preferred by most but another version of the attempted sexual assault involves Αλφειός (Alpheus, (another river god)) which differs only in detail.

Lindsay Lohan, as a Naiad, surfacing from her spring.

The Naiads were often claimed to possess powers of healing and the notion of “curing waters” persists into the twenty-first century; although some of this is quackery there is a scientific basis in some cases and the origin of the use of lithium as an early anti-depressant was physicians in Ancient Greek noting the drinking of waters from a certain place “cured men of melancholy”.  Those waters turned out to have a pharmacologically significant lithium content.  However, not all naiads could be used so efficaciously because bathing in certain springs or rivers could be considered sacrilegious, even if it was someone exulted taking a dip.  Nero (Nero Claudius Caesar Augustus Germanicus (37-68; Roman emperor (and the final emperor of the Julio-Claudian dynasty) 54-68)) was attacked by fever and some sort of partial paralysis and after bathing in the source of the Aqua Marcia and the Roman scuttlebutt was he’s incurred the displeasure of the Naiads, something which brought Nero’s subjects some delight.  Clearly, one upset a Naiad a one’s own risk because it was said also they could visit madness upon those who laid eyes on them, the nymphs possessing the mortal spirit of a transgressor and driving them to insanity.  For this reasons, travelers were warned (the Trip Advisor concept is not new) Naiads were particularly numerous in the Péloponnèse, a place of many waterways.