The Caisson (藻井;綺井), 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 decorated.
Common shapes include square, octagon, hexagon, circle, and a combination of these.