The Caisson (Chinese: 藻井; pinyin: zǎojǐng; literally "algae well"),
also referred to as a caisson ceiling, or spider web ceiling, in East
Asian architecture is an architectural feature typically found in the
ceiling of temples and palaces, usually at the centre and directly
above the main throne, seat, or religious figure. The caisson is
generally a sunken panel set into the otherwise largely flat ceiling.
It is often layered and richly decoracted. Common shapes include
square, octagon, hexagon, circle, and a combination of these.
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