Ceiling of building in Imperial garden - Forbidden City

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

Chinese architecture Chinese architecture () is the embodiment of an architectural style that has developed over millennia in China and has influenced architecture throughout East Asia. Since its emergence during the early ancient era, the structural principles of ...

is an architectural feature typically found in the ceiling of

temple A temple (from the Latin ) is a place of worship, a building used for spiritual rituals and activities such as prayer and sacrifice. By convention, the specially built places of worship of some religions are commonly called "temples" in Engli ...

s and

palace A palace is a large residence, often serving as a royal residence or the home for a head of state or another high-ranking dignitary, such as a bishop or archbishop. The word is derived from the Latin name palātium, for Palatine Hill in Rome whi ...

s, 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, al ...

. In the case of

, 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 the use of the ''

dougong ''Dougong'' (Chinese language, Chinese: 斗拱; pinyin: ''dǒugǒng''; lit. 'cap ndblock') is a structural element of interlocking wooden Bracket (architecture), brackets, important in traditional Chinese architecture for both its struct ...

'' (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, 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 remain attached to a solid background of the same material. The term ''relief'' is from the Latin verb , to raise (). To create a sculpture in relief is to give the impression that th ...

'' carving or painting. Common themes include "two

dragon A dragon is a Magic (supernatural), magical legendary creature that appears in the folklore of multiple cultures worldwide. Beliefs about dragons vary considerably through regions, but European dragon, dragons in Western cultures since the Hi ...

s chasing the

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

". Caissons in the

throne A throne is the seat of state of a potentate or dignitary, especially the seat occupied by a sovereign (or viceroy A viceroy () is an official who reigns over a polity in the name of and as the representative of the monarch of the territory ...

rooms of the

Forbidden City The Forbidden City () is the Chinese Empire, imperial Chinese palace, palace complex in the center of the Imperial City, Beijing, Imperial City in Beijing, China. It was the residence of 24 Ming dynasty, Ming and Qing dynasty, Qing dynasty L ...

feature a large, writhing

, from whose mouth issue a chandelier-like structure called the

Yellow Emperor The Yellow Emperor, also known as the Yellow Thearch, or Huangdi ( zh, t=黃帝, s=黄帝, first=t) in Chinese, is a mythical Chinese sovereign and culture hero included among the legendary Three Sovereigns and Five Emperors. He is revered as ...

Mirror, a series of metal balls which are said to be able to show reflections of evil spirits. Caissons were originally used to support

skylight A skylight (sometimes called a rooflight) is a light-permitting structure or window, usually made of transparent or translucent glass, that forms all or part of the roof space of a building for daylighting and ventilation purposes. History O ...

s. Therefore, they are a relatively recent structure in Chinese architectural history.

Use in other structures

The caisson has been found in tombs of the

Han dynasty The Han dynasty was an Dynasties of China, imperial dynasty of China (202 BC9 AD, 25–220 AD) established by Liu Bang and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–206 BC ...

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 common Chinese name of the bodhisattva associated with Karuṇā, compassion known as Avalokiteśvara (). Guanyin is short for Guanshiyin, which means " he One WhoPerceives the Sounds of the World". Originally regarded as m ...

in the Guanyin Pavilion of Dule Monastery, Jixian,

Hebei Hebei is a Provinces of China, province in North China. It is China's List of Chinese administrative divisions by population, sixth-most populous province, with a population of over 75 million people. Shijiazhuang is the capital city. It bor ...

province, built in 984 during the Liao dynasty.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

, 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 or ...

ceiling, constructed of woven wooden strips or

sorghum ''Sorghum bicolor'', commonly called sorghum () and also known as great millet, broomcorn, guinea corn, durra, imphee, jowar, or milo, is a species in the Poaceae, grass genus ''Sorghum (genus), Sorghum'' cultivated for its grain. The grain i ...

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 Buddhadharma and Dharmavinaya, is an Indian religion and List of philosophies, philosophical tradition based on Pre-sectarian Buddhism, teachings attributed to the Buddha, a wandering teacher who lived in the 6th or ...

grottos, such as in

Dunhuang Dunhuang () is a county-level city in northwestern Gansu Province, Western China. According to the 2010 Chinese census, the city has a population of 186,027, though 2019 estimates put the city's population at about 191,800. Sachu (Dunhuang) was ...

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, usually dome-like structure on top of a building often crowning a larger roof or dome. Cupolas often serve as a roof lantern to admit light and air or as a lookout. The word derives, via Ital ...

s and

dome A dome () is an architectural element similar to the hollow upper half of a sphere. There is significant overlap with the term cupola, which may also refer to a dome or a structure on top of a dome. The precise definition of a dome has been a m ...

s 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