Īfter drying, it is placed in a kiln or atop combustible material in a pit, and then fired. Other shaping techniques, such as throwing and slip casting are also used. A combination of these may also be used: building up the broad shape and then removing pieces, or adding more, to produce details. Articles can be formed by both an "additive" technique, adding portions of clay to the growing pieces, or a "subtractive" one, carving into a solid lump with a knife or similar tool. Prior to firing terracotta clays can be easily shaped. 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. Glazed architectural terracotta and its unglazed version as exterior surfaces for buildings were used in East Asia for some centuries before becoming popular in the West in the 19th century.
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