An arched ceiling is a type of architectural feature that is created by the use of curved or pointed arches. The term 'APSE' refers to a large semicircular or polygonal recess in a building, usually at the end of a church or chapel. A VAULT is an arched structure, typically made of stone or brick, used to form a ceiling or roof. An instep is an arch-shaped structure that is used to support a wall or ceiling. All three of these terms are related to the concept of an arched ceiling.