Molding (decorative)

Moulding (also spelled molding in the United States though usually not within the industry), also known as coving (United Kingdom, Australia), is a strip of material with various profiles used to cover transitions between surfaces or for decoration. It is traditionally made from solid milled wood or plaster, but may be of plastic or reformed wood. In classical architecture and sculpture, the molding is often carved in marble or other stones.

Cavetto molding and resulting shadow pattern
Ovolo molding and resulting shadow pattern
Cyma recta molding and resulting shadow pattern

A "plain" molding has right-angled upper and lower edges. A "sprung" molding has upper and lower edges that bevel towards its rear, allowing mounting between two non-parallel planes (such as a wall and a ceiling), with an open space behind. Moldings may be decorated with paterae as long, uninterrupted elements may be boring for eyes.