Terracotta, terra cotta or terra-cotta (pronounced [ˌtɛrraˈkɔtta]; Italian: "baked earth",  from the Latin terra cocta),  a type of earthenware, is a clay-based unglazed or glazed ceramic,  where the fired body is porous. Terracotta is the term normally used for sculpture made in earthenware, and also for various utilitarian uses including vessels ( notably flower pots), water and waste water pipes, roofing tiles, bricks, and surface embellishment in building construction.  The term is also used to refer to the natural brownish orange color of most terracotta, which varies considerably.
This article covers the senses of terracotta as a medium in sculpture, as in the Terracotta Army and Greek terracotta figurines, and architectural decoration. Asian and European sculpture in porcelain is not covered. Glazed architectural terracotta and its unglazed version as exterior surfaces for buildings were used in Asia for some centuries before becoming popular in the West in the 19th century. Architectural terracotta can also refer to decorated ceramic elements such as antefixes and revetments, which made a large contribution to the appearance of temples and other buildings in the classical architecture of Europe, as well as in the Ancient Near East.
In archaeology and art history, "terracotta" is often used to describe objects such as figurines not made on a potter's wheel. Vessels and other objects that are or might be made on a wheel from the same material are called earthenware pottery; the choice of term depends on the type of object rather than the material or firing technique.  Unglazed pieces, and those made for building construction and industry, are also more likely to be referred to as terracotta, whereas tableware and other vessels are called earthenware (though sometimes terracotta if unglazed), or by a more precise term such as faience.
An appropriate refined clay is formed to the desired shape. After drying it is placed in a kiln or atop combustible material in a pit, and then fired. The typical firing temperature is around 1,000 °C (1,830 °F), though it may be as low as 600 °C (1,112 °F) in historic and archaeological examples.  The iron content, reacting with oxygen during firing, gives the fired body a reddish color, though the overall color varies widely across shades of yellow, orange, buff, red, "terracotta", pink, grey or brown.  In some contexts, such as Roman figurines, white-colored terracotta is known as pipeclay, as such clays were later preferred for tobacco pipes, normally made of clay until the 19th century.[ citation needed]
Fired terracotta is not watertight, but surface-burnishing the body before firing can decrease its porousness and a layer of glaze can make it watertight. It is suitable for use below ground to carry pressurized water (an archaic use), for garden pots or building decoration in many environments, and for oil containers, oil lamps, or ovens. Most other uses, such as for tableware, sanitary piping, or building decoration in freezing environments, require the material to be glazed. Terracotta, if uncracked, will ring if lightly struck.
Painted ("polychrome") terracotta is typically first covered with a thin coat of gesso, then painted. It has been very widely used but the paint is only suitable for indoor positions and is much less durable than fired colors in or under a ceramic glaze. Terracotta sculpture was very rarely left in its "raw" fired state in the West until the 18th century. 
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Terracotta/earthenware was the only known type of ceramic produced by Western and pre-Columbian people until the 14th century, when imported European fired stoneware began production. Terracotta has been used throughout history for sculpture and pottery as well as for bricks and roof shingles. In ancient times, the first clay sculptures were dried (baked) in the sun after being formed. They were later placed in the ashes of open hearths to harden, and finally kilns were used, similar to those used for pottery today. However, only after firing to high temperature would it be classed as a ceramic material.
Terracotta female figurines were uncovered by archaeologists in excavations of Mohenjo-daro, Pakistan (3000–1500 BC). Along with phallus-shaped stones, these suggest some sort of fertility cult and a belief in a mother goddess.  The Burney Relief is an outstanding terracotta plaque from Ancient Mesopotamia of about 1950 BC. In Mesoamerica, the great majority of Olmec figurines were in terracotta. Many ushabti mortuary statuettes were also made of terracotta in Ancient Egypt.
The Ancient Greeks' Tanagra figurines were mass-produced mold-cast and fired terracotta figurines, that seem to have been widely affordable in the Hellenistic period, and often purely decorative in function. They were part of a wide range of Greek terracotta figurines, which included larger and higher-quality works such as the Aphrodite Heyl; the Romans too made great numbers of small figurines, often religious. Etruscan art often used terracotta in preference to stone even for larger statues, such as the near life-size Apollo of Veii and the Sarcophagus of the Spouses. Campana reliefs are Ancient Roman terracotta reliefs, originally mostly used to make friezes for the outside of buildings, as a cheaper substitute for stone.
Indian sculpture made heavy use of terracotta from as early as the Indus Valley Civilization (with stone and metal sculpture being rather rare), and in more sophisticated areas had largely abandoned modeling for using molds by the 1st century BC. This allows relatively large figures, nearly up to life-size, to be made, especially in the Gupta period and the centuries immediately following it. Several vigorous local popular traditions of terracotta folk sculpture remain active today, such as the Bankura horses. 
Precolonial West African sculpture also made extensive use of terracotta.  The regions most recognized for producing terracotta art in that part of the world include the Nok culture of central and north-central Nigeria, the Ife/ Benin cultural axis in western and southern Nigeria (also noted for its exceptionally naturalistic sculpture), and the Igbo culture area of eastern Nigeria, which excelled in terracotta pottery. These related, but separate, traditions also gave birth to elaborate schools of bronze and brass sculpture in the area. 
Chinese sculpture made great use of terracotta, with and without glazing and colour, from a very early date. The famous Terracotta Army of Emperor Qin Shi Huang, 209–210 BC, was somewhat untypical, and two thousand years ago reliefs were more common, in tombs and elsewhere. Later Buddhist figures were often made in painted and glazed terracotta, with the Yixian glazed pottery luohans, probably of 1150–1250, now in various Western museums, among the finest examples.  Brick-built tombs from the Han dynasty were often finished on the interior wall with bricks decorated on one face; the techniques included molded reliefs. Later tombs contained many figures of protective spirits and animals and servants for the afterlife, including the famous horses of the T'ang dynasty; as an arbitrary matter of terminology these tend not to be referred to as terracottas. 
European medieval art made little use of terracotta sculpture, until the late 14th century, when it became used in advanced International Gothic workshops in parts of Germany.  The Virgin illustrated at the start of the article from Bohemia is the unique example known from there.  A few decades later there was a revival in the Italian Renaissance, inspired by excavated classical terracottas as well as the German examples, which gradually spread to the rest of Europe. In Florence Luca della Robbia (1399/1400–1482) was a sculptor who founded a family dynasty specializing in glazed and painted terracotta, especially large roundels which were used to decorate the exterior of churches and other buildings. These used the same techniques as contemporary maiolica and other tin-glazed pottery. Other sculptors included Pietro Torrigiano (1472–1528), who produced statues, and in England busts of the Tudor royal family. The unglazed busts of the Roman Emperors adorning Hampton Court Palace, by Giovanni da Maiano, 1521, were another example of Italian work in England.  They were originally painted but this has now been lost from weathering.
In the 18th-century unglazed terracotta, which had long been used for preliminary clay models or maquettes that were then fired, became fashionable as a material for small sculptures including portrait busts. It was much easier to work than carved materials, and allowed a more spontaneous approach by the artist.  Claude Michel (1738–1814), known as Clodion, was an influential pioneer in France.  John Michael Rysbrack (1694–1770), a Flemish portrait sculptor working in England, sold his terracotta modelli for larger works in stone, and produced busts only in terracotta.  In the next century the French sculptor Albert-Ernest Carrier-Belleuse made many terracotta pieces,  but possibly the most famous is The Abduction of Hippodameia depicting the Greek mythological scene of a centaur kidnapping Hippodameia on her wedding day.
Terracotta tiles have a long history in many parts of the world, covered in that article. Many ancient and traditional roofing styles included more elaborate sculptural elements than the plain roof tiles, such as Chinese Imperial roof decoration and the antefix of western classical architecture. In India West Bengal made a speciality of terracotta temples, with the sculpted decoration from the same material as the main brick construction.
In the 19th century the possibilities of terracotta decoration of buildings were again appreciated by architects, often using thicker pieces of terracotta, and surfaces that are not flat.  The American architect Louis Sullivan is well known for his elaborate glazed terracotta ornamentation, designs that would have been impossible to execute in any other medium. Terracotta and tile were used extensively in the town buildings of Victorian Birmingham, England. By about 1930 the widespread use of concrete and Modernist architecture largely ended the use of terracotta in architecture. 
As compared to bronze sculpture, terracotta uses a far simpler and quicker process for creating the finished work with much lower material costs. The easier task of modelling, typically with a limited range of knives and wooden shaping tools, but mainly using the fingers,  allows the artist to take a more free and flexible approach. Small details that might be impractical to carve in stone, of hair or costume for example, can easily be accomplished in terracotta, and drapery can sometimes be made up of thin sheets of clay that make it much easier to achieve a realistic effect. 
Reusable mold-making techniques may be used for production of many identical pieces. Compared to marble sculpture and other stonework the finished product is far lighter and may be further painted and glazed to produce objects with color or durable simulations of metal patina. Robust durable works for outdoor use require greater thickness and so will be heavier, with more care needed in the drying of the unfinished piece to prevent cracking as the material shrinks. Structural considerations are similar to those required for stone sculpture; there is a limit on the stress that can be imposed on terracotta, and terracotta statues of unsupported standing figures are limited to well under life-size unless extra structural support is added. This is also because large figures are extremely difficult to fire, and surviving examples often show sagging or cracks.  The Yixian figures were fired in several pieces, and have iron rods inside to hold the structure together. 
Indian terracotta figures, Gupta dynasty
Han dynasty "tomb brick" relief
Glazed building decoration at the Forbidden City, Beijing
Terracotta temple, Bishnupur, India, a famous centre for terracotta temples
Hindu temple, 1739, Kalna, India
Terracotta designs outside the Kantajew Temple, Dinajpur, Bangladesh
The Bell Edison Telephone Building, Birmingham, England.
- Majapahit Terracotta
- Kulhar (traditional terracotta cups)
- Tile Heritage Foundation
- Structural Clay Tile
- Bust of the Virgin, ca. 1390–95, In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. (October 2008)
- "Terracotta", p. 341, Delahunty, Andrew, From Bonbon to Cha-cha: Oxford Dictionary of Foreign Words and Phrases, 2008, OUP Oxford, ISBN 0199543690, 9780199543694
- OED, "Terracotta"; "Terracotta", MFA Boston, "Cameo" database
- 'Industrial Ceramics.' F.Singer, S.S.Singer. Chapman & Hall. 1971. Quote: "The lighter pieces that are glazed may also be termed 'terracotta.'
- Peek, Philip M., and Yankah, African Folklore: An Encyclopedia, 2004, Routledge, ISBN 1135948720, 9781135948726, google books
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- Jacob Neusner, ed. World Religions in America. Louisville: Westminster John Knox Press, 2003.
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- H. Meyerowitz; V. Meyerowitz (1939). "Bronzes and Terra-Cottas from Ile-Ife". The Burlington Magazine for Connoisseurs 75 (439), 150–152; 154–155.
- Grove, 3
- Rawson, 140-145, ; Grove, 4
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- Schultz, 67-68
- Bust of the Virgin, ca. 1390–95, In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000–. (October 2008)
- Grove, "Florence"
- Draper and Scherf, 2-7 and throughout; Grove, 2, i, a and c
- Well covered in Draper and Scherf, see index; Grove, 2, i, a and c
- Grove, 2, i, c
- Grove, 2, i, d
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- Grove, 2, i, a; Scultz, 167
- Scultz, 67, 167
- Scultz, 167; Hobson, R.L. “A New Chinese Masterpiece in the British Museum.” The Burlington Magazine for Connoisseurs, Vol. 25, No. 134 (May, 1914), p. 70, JSTOR
- Lecture by Derek Gillman at the Penn Museum, on their example and the group of Yixian figures. From YouTube
- Draper, James David and Scherf, Guilhem (eds.), Playing with Fire: European Terracotta Models, 1740-1840, 2003, Metropolitan Museum of Art, ISBN 1588390993, 9781588390998, fully available on Google books
- "Grove" = C. A. Galvin, et al. "Terracotta." Grove Art Online. Oxford Art Online. Oxford University Press, accessed July 23, 2015, subscription required.
- Schultz, Ellen (ed). Gothic and Renaissance Art in Nuremberg, 1986, New York, Metropolitan Museum of Art, ISBN 9780870994661, google books
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- Article on terracotta in Victorian and Edwardian Terracotta Buildings
- Bibliography, Smithsonian Institution, Ceramic Tiles and Architectural Terracotta
- Friends of Terra Cotta, non-profit foundation to promote education and preservation of architectural Terracotta
- Tiles and Architectural Ceramics Society (UK)
- Guidance on Matching Terracotta Practical guidance on the repair and replacement of historic terracotta focusing on the difficulties associated with trying to match new to old