A coffer (also known as a caisson or lacuna) is a decorative sunken panel in a ceiling or dome, typically square or octagonal in shape. The purpose of a coffer in architecture is to add depth and interest to a ceiling or dome by breaking up the space into a series of recessed panels. This technique is often used in Classical and Renaissance architecture and is particularly prevalent in the design of grand public buildings such as government palaces, courthouses, and libraries. The coffer may be decorated with a variety of motifs, such as rosettes, quatrefoils, or geometric patterns, and may be painted or gilded to add further refinement.
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