In architecture and decorative art, ornament is a decoration used to embellish parts of a building or object. Large figurative elements such as monumental sculpture and their equivalents in decorative art are excluded from the term; most ornament does not include human figures, and if present they are small compared to the overall scale. Architectural ornament can be carved from stone, wood or precious metals, formed with plaster or clay, or painted or impressed onto a surface as applied ornament; in other applied arts the main material of the object, or a different one such as paint or vitreous enamel may be used.
A wide variety of decorative styles and motifs have been developed for architecture and the applied arts, including pottery, furniture, metalwork. In textiles, wallpaper and other objects where the decoration may be the main justification for its existence, the terms pattern or design are more likely to be used. The vast range of motifs used in ornament draw from geometrical shapes and patterns, plants, and human and animal figures. Across Eurasia and the Mediterranean world there has been a rich and linked tradition of plant-based ornament for over three thousand years; traditional ornament from other parts of the world typically relies more on geometrical and animal motifs.
In a 1941 essay, the architectural historian Sir John Summerson called it "surface modulation". The earliest decoration and ornament often survives from prehistoric cultures in simple markings on pottery, where decoration in other materials (including tattoos) has been lost. Where the potter's wheel was used, the technology made some kinds of decoration very easy; weaving is another technology which also lends itself very easily to decoration or pattern, and to some extent dictates its form. Ornament has been evident in civilizations since the beginning of recorded history, ranging from Ancient Egyptian architecture to the assertive lack of ornament of 20th century Modernist architecture.
Ornament implies that the ornamented object has a function that an unornamented equivalent might also fulfill. Where the object has no such function, but exists only to be a work of art such as a sculpture or painting, the term is less likely to be used, except for peripheral elements. In recent centuries a distinction between the fine arts and applied or decorative arts has been applied (except for architecture), with ornament mainly seen as a feature of the latter class.
The history of art in many cultures shows a series of wave-like trends where the level of ornament used increases over a period, before a sharp reaction returns to plainer forms, after which ornamentation gradually increases again. The pattern is especially clear in post-Roman European art, where the highly ornamented Insular art of the Book of Kells and other manuscripts influenced continental Europe, but the classically inspired Carolingian and Ottonian art largely replaced it. Ornament increased over the Romanesque and Gothic periods, but was greatly reduced in Early Renaissance styles, again under classical influence. Another period of increase, in Northern Mannerism, the Baroque and Rococo, was checked by Neoclassicism and the Romantic period, before resuming in the later 19th century Victorian decorative arts and their continental equivalents, to be decisively reduced by the Arts and Crafts movement and then Modernism.
The detailed study of Eurasian ornamental forms was begun by Alois Riegl in his formalist study Stilfragen: Grundlegungen zu einer Geschichte der Ornamentik (Problems of style: foundations for a history of ornament) of 1893, who in the process developed his influential concept of the Kunstwollen. Riegl traced formalistic continuity and development in decorative plant forms from Ancient Egyptian art and other ancient Near Eastern civilizations through the classical world to the arabesque of Islamic art. While the concept of the Kunstwollen has few followers today, his basic analysis of the development of forms has been confirmed and refined by the wider corpus of examples known today. Jessica Rawson has recently extended the analysis to cover Chinese art, which Riegl did not cover, tracing many elements of Chinese decoration back to the same tradition; the shared background helping to make the assimilation of Chinese motifs into Persian art after the Mongol invasion harmonious and productive.
Styles of ornamentation can be studied in reference to the specific culture which developed unique forms of decoration, or modified ornament from other cultures. The Ancient Egyptian culture is arguably the first civilization to add pure decoration to their buildings. Their ornament takes the forms of the natural world in that climate, decorating the capitals of columns and walls with images of papyrus and palm trees. Assyrian culture produced ornament which shows influence from Egyptian sources and a number of original themes, including figures of plants and animals of the region.
Ancient Greek civilization created many new forms of ornament, with regional variations from Doric, Ionic, and Corinthian groups. The Romans Latinized the pure forms of the Greek ornament and adapted the forms to every purpose.
Ornament prints and pattern books
A few medieval notebooks survive, most famously that of Villard de Honnecourt (13th century) showing how artists and craftsmen recorded designs they saw for future use. With the arrival of the print, ornament prints became an important part of the output of printmakers, especially in Germany, and played a vital role in the rapid diffusion of new Renaissance styles to makers of all sorts of object. As well as revived classical ornament, both architectural and the grotesque style derived from Roman interior decoration, these included new styles such as the moresque, a European adaptation of the Islamic arabesque (a distinction not always clear at the time).
As printing became cheaper, the single ornament print turned into sets, and then finally books. From the 16th to the 19th century, pattern books were published in Europe which gave access to decorative elements, eventually including those recorded from cultures all over the world. Andrea Palladio's I quattro libri dell'architettura (Four Books on Architecture) (Venice, 1570), which included both drawings of classical Roman buildings and renderings of Palladio's own designs utilizing those motifs, became the most influential book ever written on architecture. Napoleon had the great pyramids and temples of Egypt documented in the Description de l'Egypte (1809). Owen Jones published The Grammar of Ornament in 1856 with colored illustrations of decoration from Egypt, Turkey, Sicily and Spain. He took residence in the Alhambra Palace to make drawings and plaster castings of the ornate details of the Islamic ornaments there, including arabesques, calligraphy, and geometric patterns. Interest in classical architecture was also fueled by the tradition of traveling on The Grand Tour, and by translation of early literature about architecture in the work of Vitruvius and Michelangelo.
During the 19th century, the acceptable use of ornament, and its precise definition became the source of aesthetic controversy in academic Western architecture, as architects and their critics searched for a suitable style. "The great question is," Thomas Leverton Donaldson asked in 1847, "are we to have an architecture of our period, a distinct, individual, palpable style of the 19th century?". In 1849, when Matthew Digby Wyatt viewed the French Industrial Exposition set up on the Champs-Elysées in Paris, he disapproved in recognizably modern terms of the plaster ornaments in faux-bronze and faux woodgrain:
Both internally and externally there is a good deal of tasteless and unprofitable ornament... If each simple material had been allowed to tell its own tale, and the lines of the construction so arranged as to conduce to a sentiment of grandeur, the qualities of "power" and "truth," which its enormous extent must have necessarily ensured, could have scarcely fail to excite admiration, and that at a very considerable saving of expense.
Contacts with other cultures through colonialism and the new discoveries of archaeology expanded the repertory of ornament available to revivalists. After about 1880, photography made details of ornament even more widely available than prints had done.
Modern millwork ornaments are made of wood, plastics, composites, etc. They come in many different colours and shapes. Modern architecture, conceived of as the elimination of ornament in favor of purely functional structures, left architects the problem of how to properly adorn modern structures. There were two available routes from this perceived crisis. One was to attempt to devise an ornamental vocabulary that was new and essentially contemporary. This was the route taken by architects like Louis Sullivan and his pupil Frank Lloyd Wright, or by the unique Antoni Gaudí. Art Nouveau, popular around the turn of the 20th century, was in part a conscious effort to evolve such a "natural" vocabulary of ornament.
A more radical route abandoned the use of ornament altogether, as in some designs for objects by Christopher Dresser. At the time, such unornamented objects could have been found in many unpretending workaday items of industrial design, ceramics produced at the Arabia manufactory in Finland, for instance, or the glass insulators of electric lines.
This latter approach was described by architect Adolf Loos in his 1908 manifesto, translated into English in 1913 and polemically titled Ornament and Crime, in which he declared that lack of decoration is the sign of an advanced society. His argument was that ornament is economically inefficient and "morally degenerate", and that reducing ornament was a sign of progress. Modernists were eager to point to American architect Louis Sullivan as their godfather in the cause of aesthetic simplification, dismissing the knots of intricately patterned ornament that articulated the skin of his structures.
With the work of Le Corbusier and the Bauhaus through the 1920s and 1930s, lack of decorative detail became a hallmark of modern architecture and equated with the moral virtues of honesty, simplicity, and purity. In 1932 Philip Johnson and Henry-Russell Hitchcock dubbed this the "International Style". What began as a matter of taste was transformed into an aesthetic mandate. Modernists declared their way as the only acceptable way to build. As the style hit its stride in the highly developed postwar work of Mies van der Rohe, the tenets of 1950s modernism became so strict that even accomplished architects like Edward Durrell Stone and Eero Saarinen could be ridiculed and effectively ostracized for departing from the aesthetic rules.
At the same time, the unwritten laws against ornament began to come into serious question. "Architecture has, with some difficulty, liberated itself from ornament, but it has not liberated itself from the fear of ornament," John Summerson observed in 1941. 
The very difference between ornament and structure is subtle and perhaps arbitrary. The pointed arches and flying buttresses of Gothic architecture are ornamental but structurally necessary; the colorful rhythmic bands of a Pietro Belluschi International Style skyscraper are integral, not applied, but certainly have ornamental effect. Furthermore, architectural ornament can serve the practical purpose of establishing scale, signaling entries, and aiding wayfinding, and these useful design tactics had been outlawed. And by the mid-1950s, modernist figureheads Le Corbusier and Marcel Breuer had been breaking their own rules by producing highly expressive, sculptural concrete work.
The argument against ornament peaked in 1959 over discussions of the Seagram Building, where Mies van der Rohe installed a series of structurally unnecessary vertical I-beams on the outside of the building, and by 1984, when Philip Johnson produced his AT&T Building in Manhattan with an ornamental pink granite neo-Georgian pediment, the argument was effectively over. In retrospect, critics have seen the AT&T Building as the first Postmodernist building.
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- Summerson, John (1941) printed in Heavenly Mansions 1963, p. 217
- Tabbaa, 74-75
- Rawson, 24-25; see also "“Style”—or whatever", J. Duncan Berry, A review of Problems of Style by Alois Riegl, The New Criterion, April 1993
- Rawson, the subject of her book, see Preface, and Chapter 5 on Chinese influences on Persian art.
- The Center for Palladian Studies in America, Inc.,"Palladio and his Books." Archived 2018-07-05 at the Wayback Machine
- quoted by Summerson
- Second Republic Exposition Archived 2006-02-12 at the Wayback Machine
- Sankovitch, Anne-Marie (12/1/1998). "Structure/ornament and the modern figuration of architecture". The Art Bulletin. Archived from the original on November 7, 2007. Retrieved 2007-11-13. Cite journal requires
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- James, Trilling. "The Language of Ornament". p. 186-210. ISBN 0-500-20343-1.
- "Slogans and Battlecries | Paul Shepheard | Architect | Writer". www.paulshepheard.com. Retrieved 2018-05-12.
19th-century compendiums of ornament
- Dolmetsch, Heinrich (1898). The Treasury of Ornament. (s:de:Heinrich Dolmetsch)
- Owen Jones (1856) The Grammar of Ornament.
- Meyer, Franz Sales, (1898), A Handbook of Ornament
- Speltz, Alexander (1915). The Coloured Ornament of All Historical Styles.
- Lewis, Philippa; G. Darley (1986). Dictionary of Ornament. New York: Pantheon. ISBN 0-394-50931-5.
- Rawson, Jessica, Chinese Ornament: The lotus and the dragon, 1984, British Museum Publications, ISBN 0-7141-1431-6
- Tabbaa, Yasser, The transformation of Islamic art during the Sunni revival, I.B.Tauris, 2002, ISBN 1-85043-392-5, ISBN 978-1-85043-392-7, google books
- James Trilling The Language of Ornament
- Peterson, Sara, Ornament and Pattern in Western Art: Renaissance and Mannerist; Baroque; Rococo; Neoclassical; Historicist and Traditional Historicism; 19th century Reform Movement; 20th century, Grove's Dictionary of Art, edited Jane Turner, 1996