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H O to H Z



hollow building - A ceramic technique for sculpture in which the form is built up from slabs and tubes of damp clay in such a way that it is hollow throughout. Ceramic sculptures are made hollow, chiefly to ensure that no part is much thicker than any other; such differences in thickness would create tensions in the clay during firing, as the clay shrinks in cooling.



hollow carving - Wooden sculptures are often hollowed or partly hollowed in order to avoid strain resulting from the different rates of shrinkage in heartwood and sapwood. stone is also hollowed out, but to enable it to be supported (especially in the case of a bust, for example) or to be lifted and transported more easily. Ceramic sculptures are made hollow, chiefly to ensure that no part is much thicker than any other; such differences in thickness would create tensions in the clay during firing, as the clay shrinks in cooling.



hollow casting - Casting in a mold by lining the walls of the mold with layers of sculpture material rather than filling up the mold. The technique varies with the medium being used. Cast metal sculptures are made hollow chiefly to ensure that no part is much thicker than any other; such differences in thickness would create tensions in the metal as it shrinks in cooling.



holography - A medium for producing a three-dimensional image of an object by recording on a photographic film the pattern of interference formed by a split laser beam and then illuminating the pattern either with a laser or with ordinary light. The resulting object is a hologram, also known as a holograph.

(pr. ho-LAHG-rə-fee)

Other resources about holography:



homage - Special acknowledgment or respect shown or expressed publicly to persons whose influence an artist wishes to honor.

(pr. HAHM-'əj)

An example of a work done in homage to another artist:

Larry Rivers (American, 1923-2002), Dutch Masters I, 1963, oil on canvas, Cheekwood Art Museum, Nashville.

A quotation apropos homage:



homogeneity, homogeneous - Homogeneity is the quality of uniformity of structure throughout or composed of parts that are all of the same nature or kind.

Also see balance, coherence, complexity, monotony, pattern, principles of design, and unity.



hooptedoodle - A literary word that, technically, has no place being in this dictionary. Hooptedoodle is stuff that gets in the way of a story's making progress, it is wordy, unnecessary, space-taking, and, typically, should be edited out. Related to balderdash, folderol, flummery, foolishness, and fill; nonsense, prattle, blather, bombast, and baloney.

Quotes about hooptedoodle:

Also see bad art, banausic, bric-a-brac, brummagem, camp, decoration, decorative, decorative arts, gewgaw, kitsch, ornament, taste, and tchotchke.



horizon line - A level line where water or land seems to end and the sky begins. Vanishing points are usually located on this line. The image behind this text features a horizon line separating sky from sea — which, as you look lower, morphs into sky again, etc. (Notice too, the way rows of waves are depicted as receeding toward vanishing points.)


Other resources concerned with horizon line:



horizontal - Straight and flat across, parallel to the horizon. The opposite is vertical. All other directions are diagonal.

Examples of notably horizontal works:

Maurits Cornelis Escher (Dutch , 1898-1972), Metamorphosis II. See metamorphosis, Op Art, optical illusion, and tessellation.

see thumbnail above Kenneth Snelson (American, 1927-), Brooklyn Bridge, 1980, gelatin silver print, 15 1/2 x 91 5/15 inches, Cleveland Museum of Art. See panorama and photography.

In graphics software, to make the following change is to

"flip horizontally"a dog facing to the leftis flipped horizontally when it is seen asa dog facing to the right

Also see align and alignment, frieze, horizon line, invert, and perpendicular.



horn - One of a pair of pointy projections, either straight, curved or helical, which have grown from the head of an animal. The animals that have horns include cows, sheep, goats, antelope, and their relatives. The rhinoceros is an exception because its single horn grows from its nasal bone. Deer grow antlers instead of horns. Antlers are made of bone, and go through annual cycles of growing out and shedding. "Horn" can also refer to a substance which is the outermost part of a horn — tough keratin, a type of protein. It usually develops as a conical sheath over bone. Keratin also covers the hooves, claws, and nails of various animals, as well as armadillo and tortoise shells, the scales of the pangolin, porcupine quills, and birds' feathers. A rhinoceros horn is the only horn that is a solid growth of keratin. It also consists of some fused hair.

Horn has been used as a medium in the production of combs, buttons, the handles of canes and knives, drinking-cups, spoons, snuff-boxes, and other objects.

Trade in the horns of certain animals is unethical (sometimes illegal) often because its species is in danger of extinction. Antlers are more ethical to use in producing art, because antlers are naturally shed by deer (and related animals) annually, falling to the ground where they can be collected. Various plastics simulate horn quite well. Plastics might be considered a more moral alternative to horn or as an overly artificial substitute. Horn is comparable in some ways to ivory, teeth, bone, and shell; the use of any of which is also capable of generating ethical dilemmas. Wood, glass, and stone are among the other alternatives to horn.

The unicorn is a mythological horse that projects one horn from its forehead.

Devils, cuckholds, and various fantastic creatures are traditionally depicted as having horns.

Hollow horns have been used as vessels. "Powderhorns" hold gunpowder, and were long made of horn. A cornucopia or "horn of plenty" is a goat's horn overflowing with fruit, flowers and grain. The legendary Greek nymph Amalthea's magical horn rewarded its possessor's every wish. Now the cornucopia is a symbol of abundance.

In music, either an early instrument made of an animal's horn (e.g. see thumbnail to righta shofar), or a wind instrument made of brass and consisting of a long tube with a flared end that produces a sound when the player's lips vibrate together in the mouthpiece — barritone horns, bugles, saxophones, French horns, tubas, Flugelhorns, trombones, cornettes, and trumpets.

Any shape or form which resembles a horn, such as one of the curved ends of a crescent, a mountain peak, an erect penis, the beak-shaped part of an anvil, etc.

Examples of works employing horns as either material or content:




Parthia, Rhyton, 2nd-1st centuries BCE, ivory, Hermitage Museum, St. Petersburg, Russia. See rhyton.



see thumbnail to leftGermany, Crossbow of Ulrich V, Duke of Württemberg, 1460, wood, iron, ivory, horn, whalebone, tendon, length 28 1/4 inches (71.7 cm), Metropolitan Museum of Art, NY. See arms and armor.




André-Charles Boulle, Wardrobe (alternatively known as an Armoire), Paris, around 1700, made of oak and pine, with ebony, tortoiseshell, inlaid (marquetry) with brass and tin veneering, pewter, horn, and gilded bronze (ormolu), 102 x 58 x 25 inches (260 x 148 x 64 cm), Louvre. See furniture and wood.



Jacob Gay (American, recorded 1758-1787, New York), Powderhorn, 1759, cowhorn, length 15 1/2 inches (39.4 cm), Metropolitan Museum of Art, NY. See American Colonial art.



see thumbnail to leftJacob Kuntz (American, 1780-1876, Philadelphia), "Kentucky" Flintlock Rifle, c. 1810-15, steel, maple, brass, silver, bone, horn, length 59 1/4 inches (150.5 cm), Metropolitan Museum of Art, NY.



Gustave Moreau (French, 1826-1898), The Unicorn, 1885, oil on canvas, Musée Gustave Moreau, Paris. See Symbolism.



see thumbnail to leftTlingit or Tsimshian, native peoples of British Columbia, Canada, Ceremonial Spoon, late 19th century, mountain goat horn, copper rivets, length 27.1 cm, collected by Lt. George Thornton Emmons near Dixon's Entrance, BC, Peabody Museum, Harvard U, Cambridge, MA. Such spoons were used only for potlatch ceremonies. They were likely kept by the clan leaders or nobility in baskets or bentwood boxes. This is one of 40 such spoons in the Peabody Museum's collection.



Côte d'Ivoire (Ivory Coast), Senufo peoples, Mask, 19th-20th century, wood, horn, fiber, cotton, feather, metal, sacrificial material, height of mask 14 1/8 inches (35.9 cm), Metropolitan Museum of Art, NY. See African art.





see thumbnail to leftNigeria, Janiform Cap Mask with Horns, 19th-20th century, carved wood, pigment, horns.





A talisman of unidentified origin and meaning, probably contemporary, apparently gold, translucent red and blue gems, and bone or horn fragments. This image shows it emanating a mysterious luminosity. This jewel is analogous to purportedly powerful objects in Hollywood's pseudo-archaeological adventure stories, like the mummy and Indiana Jones movies. See talisman.



Also see animalia, auditory, cone, German art, heraldry, Kunstkabinett and Kunstkammer, nature, rhyton, satyr, scraper, spatula, taxidermy, and Wunderkabinett and Wunderkammer.



horologist and horologer - A person who practices or is skilled in horology. Horologists (alternatively called horologers) include those who design and craft timepieces, and perhaps connoisseurs of them as well. (pr. hah-RAH-le-jist and hah-RAH-lə-jer) Also see art careers.



clockworkshorology - Horology is the art and science of making timepieces — clocks, sundials, watches, etc. Horology is abbreviated horol.

(pr. hah-RAH-lə-jee)

Examples of timepiece designs:


see thumbnail to leftFrançois de Hecq (French), Coach Watch with the Arms of Cardinal Richelieu, c. 1640, silver, gilt brass, Louvre.


see thumbnail to rightParis, France, Watch: Young Louis XIV on Horseback, c. 1650, enamel, gold, diameter 2 5/16 inches (5.8 cm), Metropolitan Museum of Art, NY.


see thumbnail to leftAttributed to Pierre Phillipe Thomire and Sauvageot (French, 1751-1843), Clock with Vestals, 1785, marble, gilt bronze, Minneapolis Institute of Arts.






see thumbnail to rightSamuel Best (American, Cincinnati, 1776-1859), Tall-Case Clock, 1810-15, mahogany and cherry with maple veneer and inlay, 104 5/8 x 19 3/4 x 11 1/8 inches (265.7 x 50.2 x 28.3 cm), Cincinnati Art Museum, OH. See wood.





see thumbnail to leftAntoní Gaudí (Spanish, 1852-1926), Wall clock from the Casa Milá, Barcelona, 1906-1910, gilded wood, private collection. See architect, architecture, Art Nouveau, and Spanish art.




see thumbnail to rightCharles Rennie Mackintosh, designer (Scottish, 1868-1928), Domino Clock, c. 1917, wood, ebony, ivory, erinoid (brand of polyvinyl chloride (PVC)), Glasgow Museums. See Arts and Crafts Movement and Scottish art.



see thumbnail to leftDavid Ralston (Scottish, contemporary), Ball Clock, c. 2003, billiard balls, brass, and mixed media, 1.8 x 1.8 x .6 m, weight 35 kg, collection of the artist.



Related links:

Also see horologist, interdisciplinary, jewelry, measurement, movement, ormolu, periodicity, science and art, sequence, and time.



horror vacui - The compulsion to make marks in every space. Horror vacui is indicated by a crowded design. In Latin, it is literally, "fear of empty space" or "fear of emptiness." Some consider horror vacui one of the principles of design. Those who exclude it from their list of principles apparently interpret it as posessing an undesirable, perhaps obsessive quality, in contrast to the desirable, controlled principle of limitation, or perhaps to that of emphasis or dominance.

(pr. horror vack'wee)




see thumbnail to rightRichard Dadd (British, 1817-1886), The Fairy Feller's Master-Stroke, 1855-64, oil on canvas, 54.0 x 39.4 cm, Tate Gallery, London. After murdering his father in 1843, Dadd was diagnosed as insane and spent the rest of his life in asylums. Cut off from the outside world, he produced a series of paintings which combine a remarkable attention to detail with an individual, manic intensity. The horror vacui seen in Dadd's pictures may be a result of his severe mental illness. See art brut.


Also see allover painting, balance, busy, Collyers' Mansion, composition, folk art, interesting, monotony, passage, and Zen.



hoso-e - In Japanese art tradition, a small narrow print.

Also see hashira-e, kakemono, and kakemono-e.



hot glue, hot glue gun, hot-melt glue gun - A hot glue gun is a hand-held, pistol-like device that heats a round stick of solid adhesive, so that when it melts, and a user pulls the trigger, the melted glue can be squirted out of the nozzle at the gun's tip. Hot glue guns (also called hot-melt glue guns) are used to bond a broad range of materials. Most hardware stores and many department stores carry hot glue guns and glue sticks. Many brands are sold, varying in quality and price. Some accept nozzles having openings producing extrusions of different sizes and shapes. Most are electrical, some use batteries, and some burn butane gas. The sticks can vary in width and length (from 4-12 inches), color, translucence, and viscosity, as well as in the temperature required to melt the glue. Although lower melting point guns and glues are safer to use, the strongest glues are those with higher melting-points, and set rapidly, bonding in 30 to 60 seconds.

TAKE NOTE!Hot glue guns are reasonably safe to use. However, the gun nozzle and the glue itself become very hot. Hot enough to burn even careful users. As unpleasant and common as this experience is, this kind of adhesive is very popular for good reasons. People who like hot glue guns tolerate occasional accidents, and learn to have fewer and lesser ones. MEDICAL ALERT!Users should plan ahead for the moment they have a burn, by working near a source of WARNING!cold water — from a sink or a bucket. Quickly immersing the affected skin in cool water can minimize both pain and damage. One experience with a hot glue burn should be enough to convince any skeptic of the wisdom of this advice. Another way to prevent burns is to wear cloth gloves when using a glue gun. In the area where you and others will be using a hot glue gun, display a printed copy of an enlarged version of the notice seen here. see thumbnail to right

The heating element in a hot glue gun wears out over time. Fortunately many guns are inexpensive. This and their convenience recommends them for many applications. They are frequently used in manufacturing, packaging, stage-set, and other common crafting applications. Hot glue may be a good choice for many well-supervised school and college work, but it is less likely to be appropriate for many fine art applications, unless its relative crudeness is not objectionable. Hiding the look of hot glue in a piece of work can be difficult. If this is a problem, either use it with tremendous care or use a different adhesive or another joining method.

Related links:

Also see hazardous.




hot wire cutter - A tool for cutting Styrofoam. A wire is held taut in a frame and heated, enabling it to pass cleanly through the Styrofoam without undue pressure being applied. A hand-held or bench model may be used.




Hudson River School



hue - The name of any color as found in its pure state in the spectrum or rainbow, or that aspect of any color. May refer to a particular wavelength. Pigment colors combine differently than colors of light. The primary colors (in pigment: red, yellow, and blue; in light: red, green, and blue) together with the secondary colors (in pigment: orange, green, and violet; in light: cyan, magenta, and yellow) form the chief colors of the spectrum.

Also see brilliant, color wheel, complementary colors, cool colors, dark, deep, monochrome, pale, push and pull, saturation, tint, tone, value, and warm colors.




humanism - Any attitude that gives priority to human endeavors, their values, capacities, worth, interests, needs, and welfare, rather than to those of the gods, the spirits, the animals, or any other non-human thing. Also, the study of the humanities. The term is frequently qualified, as in "Renaissance humanism," which is characterized by a love of the achievements of the Greco-Roman world, an optimism that humans are inherently endowed with the skills necessary to reshape the world according to their own needs, and a belief in inherent human dignity. While the Renaissance humanists did not see their enlightened self-interest as a contradiction of their Christianity, a few recent demagogues identify "secular humanism" as a tacitly atheistic preoccupation with human affairs.

Artworks resulting from the humanism which arose during the Renaissance:



see thumbnail to rightLeonardo da Vinci (Italian, 1452-1519), Study of proportions, from Vitruvius's De Architectura, pen and ink, 13 1/2 x 9 5/8 inches (34.3 x 24.5 cm), Accademia, Venice. Leonardo, inspired by the mathematician Vitruvius (Roman, 1st century BCE), drew this famous picture of Vitruvian Man — a sort of ideal figure — whose arm span is equal to his height — a ratio of one, or 1:1. See a page with a math lesson plan for grades 6-8, as well as articles on drawing, proportion, and Renaissance.



see thumbnail to leftPieter Bruegel the Elder (Netherlandish, active by 1551, died 1569), The Harvesters, 1565, oil on wood panel; overall, including added strips at top, bottom, and right, 46 7/8 x 63 3/4 inches (119 x 162 cm); original painted surface 45 7/8 x 62 7/8 inches (116.5 x 159.5 cm), Metropolitan Museum of Art, NY. (On the Met's page, you can enlarge any detail.)


Also see ergonomics, isms and -ism, and multiculturalism.



humanities - The liberal arts — the non-scientific branches of study, such as philosophy, history, literature, and the arts, that are concerned with human thought and culture. On the other hand, Wilhelm Dilthey (1833-1911, German historian, psychologist, sociologist, philosopher, and student of hermeneutics) called the humanities (particularly history, law, literary criticism) the "spiritual sciences," as distinct from the the "natural sciences" (e.g. physics, chemistry, biology).

Other resources concerned with the humanities:

Also see humanism, the National Endowment for the Arts (NEA), and the National Endowment for the Humanities (NEH).



human scale - The size or proportion (scale) of a space, a part of a building, an article of furniture, or any other object, relative to the structural or functional dimensions of the human body.

Also see anatomy, architecture, design, ergonomics, figure, full-scale, lifesize, and visual scale.



hump mold - A type of drape mold, which see.



Hungarian art -

Making generalizations about the visual culture of any group of The Hungarian flagpeople is a crude endeavor, especially with a culture as diverse as Hungary's. With this thought in mind, know that this survey, as any must be, is tremendously limited in its breadth and depth.

[Expect a more in-depth article to appear here soon.]


Vilmos Zsolnay (Hungarian, 1828-1900), Vase, 1899, earthenware with iridescent metallic luster glaze, Minneapolis Institute of Arts. See Art Nouveau.



see thumbnail to leftMihály de Munkácsy (Hungarian, 1844-1900), The Music Room, 1878, oil on canvas, 35 x 46 inches (88.9 x 116.8 cm), Metropolitan Museum of Art, NY.


see thumbnail to rightAlexander (Sándor) Bortnyik (Hungarian, 1893-1976), Geometric Forms in Space, 1923, oil on canvas, 18 1/4 x 23 5/8 inches (46.4 x 60 cm), Museum of Modern Art, NY. See geometric.



László Moholy-Nagy (German, born Hungary, 1895-1946, active in the US), Untitled (Positive), c. 1922-1924, gelatin silver print from photogram negative, .237 x .178 m (9 5/16 x 7 inches), National Gallery of Art, Washington D.C. See Bauhaus and German art.



see thumbnail to leftEva Zeisel (American, born Hungary, 1906-), designer; Schramberg Majolica Factory (Schramberg, Germany), manufacturer, Inkwell, 1929-30, glazed earthenware, 3 3/8 x 9 x 9 3/8 inches (8.6 x 22.9 x 23.8 cm), Metropolitan Museum of Art, NY.


André Kertész (Hungarian, 1894-1985), photographer. See photography.


Other resources:

Also see flags of Europe.



hurrygraph - The Oxford English Dictionary says a hurrygraph is a "jocular nonce-word" meaning hurried sketch.



hydria - An ancient Etruscan or Greek water jar or jug. Typically ceramic, with rounded shoulders, with two horizontally attached handles, and a vertical handle at the neck to assist in pouring. (pr. high'dree-uh) Among the other types of Greek vases are the alabastron, amphora, kantharos, krater, kylix, kyathos, lekythos, oinochoe, pelike, phiale, pinax, pithos, pyxis, and rhyton.


Greece, Attic, Black-Figure Hydria with Scenes of Herakles, painted in the manner of the Antimenes Painter, late Archaic Period, c. 520-510 BCE, terra cotta, 20 1/8 x 13 3/8 inches (51.2 x 33.2cm), Michael C. Carlos Museum, Emory U, Atlanta, GA. See black-figure and Greek art.



see thumbnail to rightGreece, Argive, Hydria with protome of a woman, c. 460 BCE, Classical, bronze, height with handle 20 1/4 inches (51.41 cm), Metropolitan Museum of Art, NY.





hydrogen - A colorless, odorless, tasteless, slightly water-soluble, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe. The hot flame produced by a mixtureFLAMMABLE! of oxygen and hydrogen is used in welding, and in melting quartz and glass. Such a flame is also called an oxyhydrogen torch. Tritium, one of hydrogen's three isotopes, is used in luminous paint. Tank size available: 191 cubic feet. Atomic symbol H, atomic number 1.

Also see acetylene, argon, carbon dioxide, helium, and nitrogen.



hygroscopic - Having the capability of absorbing moisture. Examples of hygroscopic materials include textiles, woods, and papers.


photo of a hygrothermograph


hygrothermograph - An instrument that measures and records temperature and relative humidity.

see thumbnail to rightAn example manufactured by Preservation Equipment Ltd.

Also see art conservation, cleavage, climate control, and technology.



hyperactive - Excess of energy, restless, easily distracted, unable to sit still.



hyperbola - A plane curve having two branches, formed by the intersection of a plane with both halves of a right circular cone at an angle parallel to the axis of the cone. It is the locus of points for which the difference of the distances from two given points is a constant. (hi:-purr'bə-lə) The plural form can be either hyperbolas or hyperbolae.

Related links:

Also see arc, cone, cylinder, ellipse, hyperbole, parabola, and sphere.



hyperbole - Exaggeration used for emphasis or effect. Some Baroque ceiling paintings are extravagantly hyperbolic.

(pr. hi-PURR-bə-lee)

Also see hyperbola.




hyperlink - See hypermedia.



hypermedia - A type of computer imagery which employs a programming technique allowing users to switch between a variety of other screen images, each of which might be derived from information stored either on the same or on networked computers. The World Wide Web (WWW) is an important example of hypermedia. Another is a program called Hyperstudio. Any place on a computer screen image which serves to facilitate switching to another screen image is called a hyperlink, or a link.

Related resource:

Lasting Image is an online short story with copious hyperlinks.

Also see new media.



Hypertext Markup Language (HTML) - An encoding format for identifying and linking electronic documents used to deliver information on the Internet's World Wide Web (WWW).

Also see new media.



hypoactive - Absence of energy, lethargic, listless, very quiet.



hypostyle hall - In architecture, a hall with a roof supported by columns; applied to the colonnaded hall of the Egyptian pylon temple.




see thumbnail to rightEgypt, The Hypostyle Hall of the Great Temple of Ammon at Karnak, c. 1312-1301 BCE, 338 x 170 feet, 134 columns in 16 rows, the central avenues are about 78 feet in height, and have columns 69 feet high and 11 feet 9 inches in diameter, with capitals of the papyrus-flower or bell type, while in order to admit light through the clerestory, the side avenues are lower with columns 42 1/2 feet high and 8 feet 9 inches in diameter. The Metropolitan Museum, NY, displays a model of this hypostyle hall as it originally appeared. See Egyptian art and papyrus.




see thumbnail to rightHypostyle Hall of the Great Mosque of Córdoba, Spain, begun 786, doubled in area in the 10th century to 585 x 410 feet, with 1,200 columns supporting horseshoe arches, patterned with colored marbles and other stones. Although it was converted into Córdoba's Roman Catholic cathedral in 1238, the building is known locally as La Mezquita — The Mosque. See an aerial view of La Mezquita, showing the Christian alterations. See aerial view and Islamic art.








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