Philippe Joseph Henri Lemaire in the context of "Pediment"

Pedimental sculpture is a form of architectural sculpture designed for installation in the tympanum, the space enclosed by the architectural element called the pediment. Originally a feature of Ancient Greek architecture, pedimental sculpture started as a means to decorate a pediment in its simplest form: a low triangle, like a gable, above an horizontal base or entablature. However, as classical architecture developed from the basis of Ancient Greek and Roman architecture, the varieties of pedimental sculpture also developed. The sculpture can be either freestanding or relief sculpture, in which case it is attached to the back wall of the pediment. Harris in The Illustrated Dictionary of Historic Architecture defines pediment as "In classical architecture, the triangular gable end of the roof above the horizontal cornice, often filled with sculpture." Pediments can also be used to crown doors or windows.

In Romanesque architecture, and very often in Gothic architecture, the tympanum is usually semi-circular at the top, and the sculptural groups, usually with religious subjects, adapted to fit the new spaces. In the Renaissance triangular pediments returned, as gradually did sculptural groups within them, becoming very popular for important buildings in the 19th century.

Pediments are a form of gable in classical architecture, usually of a triangular shape. Pediments are placed above the horizontal structure of the cornice (an elaborated lintel), or entablature if supported by columns. In ancient architecture, a wide and low triangular pediment (the side angles 12.5° to 16°) typically formed the top element of the portico of a Greek temple, a style continued in Roman temples. But large pediments were rare on other types of building before Renaissance architecture. For symmetric designs, it provides a center point and is often used to add grandness to entrances.

The cornice continues round the top of the pediment, as well as below it; the rising sides are often called the "raking cornice". The tympanum is the triangular area within the pediment, which is often decorated with a pedimental sculpture which may be freestanding or a relief sculpture. The tympanum may hold an inscription, or in modern times, a clock face.