Coffer

Series of sunken panels in a ceiling or vault

A coffer in architecture is a series of sunken panels in the shape of a square, rectangle, or octagon in a ceiling, soffit or vault. A series of these sunken panels was often used as decoration for a ceiling or a vault, also called caissons ("boxes"), or lacunaria, so that a coffered ceiling can be called a lacunar ceiling: the strength of the structure is in the framework of the coffers.

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