Ceiling of building in Imperial garden - Forbidden City

The caisson (), also referred to as a caisson ceiling, or ''spider web ceiling'', in

East Asia East Asia is the eastern region of Asia, which is defined in both Geography, geographical and culture, ethno-cultural terms. The modern State (polity), states of East Asia include China, Japan, Mongolia, North Korea, South Korea, and Taiwan. ...

n architecture is an architectural feature typically found in the ceiling of

temple A temple (from the Latin ) is a building reserved for spiritual rituals and activities such as prayer and sacrifice. Religions which erect temples include Christianity (whose temples are typically called churches), Hinduism (whose temples ...

s 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 ceiling. It is often layered and richly decorated. Common shapes include squares, octagons, hexagons, circles, and a combination of these.

Name

The ''caisson'' is a general name for a

coffer A coffer (or coffering) 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 ...

. In the case of

n architecture, however, the caisson is characterised by highly developed conventions as to its structure and placement.

Structure

The caisson is a sunken panel placed in the centre of the ceiling. It is raised above the level of the ceiling through use of the ''

dougong ''Dougong'' () is a structural element of interlocking wooden brackets, one of the most important in traditional Chinese architecture. The use of dougong first appeared in buildings of the late centuries BC and evolved into a structural net ...

'' (斗栱) structure, which, through interlocking structural members, as beams were not used, creates successive levels of diminishing size. Beams may also be used to create a hexagonal or octagonal caisson surrounded by a square border. These beams, and the ''dougong'' members, are usually visible, and richly carved and often painted with deities. The centre of the caisson is decorated with a large ''

bas-relief Relief is a sculptural method in which the sculpted pieces are bonded to a solid background of the same material. The term '' relief'' is from the Latin verb ''relevo'', to raise. To create a sculpture in relief is to give the impression that th ...

'' carving or painting. Common themes include "two dragons chasing the

pearl A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carb ...

". Caissons in the

throne A throne is the seat of state of a potentate or dignitary, especially the seat occupied by a sovereign on state occasions; or the seat occupied by a pope or bishop on ceremonial occasions. "Throne" in an abstract sense can also refer to the mona ...

rooms of the

Forbidden City The Forbidden City () is a palace complex in Dongcheng District, Beijing, China, at the center of the Imperial City of Beijing. It is surrounded by numerous opulent imperial gardens and temples including the Zhongshan Park, the sacrifi ...

feature a large, writhing dragon, from whose mouth issue a chandelier-like structure called the

Yellow Emperor The Yellow Emperor, also known as the Yellow Thearch or by his Chinese name Huangdi (), is a deity ('' shen'') in Chinese religion, one of the legendary Chinese sovereigns and culture heroes included among the mytho-historical Three Soverei ...

Mirror, a series of metal balls which are said to be able to show reflections of evil spirits. Caissons were originally used to support skylights. Therefore, they are a relatively recent structure in the Chinese architectural history.

Use in other structures

The caisson has been found in tombs of the

Han Dynasty The Han dynasty (, ; ) was an imperial dynasty of China (202 BC – 9 AD, 25–220 AD), established by Liu Bang (Emperor Gao) and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–207 BC) and a warr ...

dating the use of this architectural feature back at least 2,000 years. Besides subterranean structure, the oldest existent caisson in an above-ground structure is the one located above the statue of

Guanyin Guanyin () is a Bodhisattva associated with compassion. She is the East Asian representation of Avalokiteśvara ( sa, अवलोकितेश्वर) and has been adopted by other Eastern religions, including Chinese folk religion. She ...

in the Guanyin Pavilion of Dule Monastery, Jixian,

Hebei Hebei or , (; alternately Hopeh) is a northern province of China. Hebei is China's sixth most populous province, with over 75 million people. Shijiazhuang is the capital city. The province is 96% Han Chinese, 3% Manchu, 0.8% Hui, and 0 ...

province, built in 984 during the

Liao Dynasty The Liao dynasty (; Khitan language, Khitan: ''Mos Jælud''; ), also known as the Khitan Empire (Khitan: ''Mos diau-d kitai huldʒi gur''), officially the Great Liao (), was an Dynasties in Chinese history, imperial dynasty of China that exi ...

.Steinhardt, Nancy Shatzman. "Liao: An Architectural Tradition in the Making," ''Artibus Asiae'' (Volume 54, Number 1/2, 1994): 5–39. Page 11. Without the use of interior columns, this ceiling is held up by a hidden second-floor four-sided frame with a hexagonal ceiling frame on the third floor. In traditional Chinese architecture, every facet of a building was decorated using various materials and techniques. Simple ceiling ornamentations in ordinary buildings were made of wooden strips and covered with paper. More decorative was the

lattice Lattice may refer to: Arts and design * Latticework, an ornamental criss-crossed framework, an arrangement of crossing laths or other thin strips of material * Lattice (music), an organized grid model of pitch ratios * Lattice (pastry), an orna ...

ceiling, constructed of woven wooden strips or sorghum stems fastened to the beams. The most decorative and the most complex ceiling was the caisson. Sanqing Hall (Hall of the Three Purities) is a Yuan period structure with "three" zaojing in its ceiling. A ''zaojing'' is a wooden dome over an imperial throne or statue in Chinese architecture. As the caisson became increasingly standard in formal architecture in ancient China, similar structures also appeared in

Buddhist Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and ...

grottos, such as in Dunhuang.

Cultural significance

Caissons were highly decorative and only included in important or highly decorated buildings. They had no specific cultural significance, since in structure they were equal to

cupola In architecture, a cupola () is a relatively small, most often dome-like, tall structure on top of a building. Often used to provide a lookout or to admit light and air, it usually crowns a larger roof or dome. The word derives, via Italian, fro ...

s and domes constructed around the world. However the rich ornamentation often conveyed cultural significance in the themes chosen and in display within the caissons.

Notes

External links