Jade Cong: Square Outside, Round Within
Around Lake Tai, in the lower Yangtze country of Zhejiang and Jiangsu, a late Neolithic elite went into the ground under a weight of jade. Excavators keep finding a square tube with a circular hole in the same high-status graves that also hold a flat disk. Later writers would say the square is earth and the circle is heaven. The unpaid question is whether the people who first carved those tubes thought that at all. A cong is that tube: nephrite, square outside, round within, often with faint mask faces at the corners.
Square walls, a circular bore, and corner masks
The Chinese character is 琮. Modern pinyin writes cong (also cóng). Older catalogues print the Wade-Giles spelling ts'ung, which Britannica still lists. Britannica describes a hollow cylinder or truncated cone enclosed in a rectangular body. The Met's curator text is tighter: a cylindrical tube encased in a square prism that gently tapers from top to bottom.
Look down the axis. Square outer walls. A circular bore. World History Encyclopedia's jade survey says the same pairing: a circular tube-form inside a square, sometimes notched, sometimes marked with small circles, and in some pieces up to 30 cm high and 15 cm across.
The corners carry the faces. The Met calls them simple masks with circular eyes and a bar-shaped mouth. Its audio note on object 2004.52 adds an oval bar that reads as a nose, stacked in columns, worn so low you may need a lens. Those are not portraits.
A bi is the other jade in the same graves: a flat disk with a hole. World History Encyclopedia treats cong and bi as the famous Liangzhu pair, a cylinder and a disk. The disk is a plane. The cong is a prism. Britannica adds that the form varies from squat to quite tall. A short register and a multi-section tower share a name, not a silhouette.
Liangzhu jade around Lake Tai
The Met dates Liangzhu culture to about 3200–2000 BCE and places the type on China's eastern coast. World History Encyclopedia uses about 3400 to 2250 BCE, and centers the people around Lake Tai, through Jiangsu, south to Hangzhou in Zhejiang, and east toward Shanghai. It names Mojiaoshan in Zhejiang and Sidun in Jiangsu as major sites. The ranges overlap. They do not match year for year.
Jade here means nephrite. World History Encyclopedia, citing Gina L. Barnes, says Liangzhu artifacts in true jade are nephrite. Judith Treistman's account, quoted there, is grinding: abrasive sand in a wet or oily medium, bamboo used to drill the circular holes of bracelets and bi.
Fine jade sits in the tombs of the wealthy. Ceramics were the goods of the poor, if they had any. The Met's audio guide on 2004.52 makes the same point: size and labor mark wealth and status. A piece of that scale weighs about eight to ten pounds, roughly 3.6 to 4.5 kg. That is too heavy to wear. The culture fades from the record around 2250 BCE in the World History Encyclopedia narrative, most likely after flooding.
Grave goods, not ornaments you wear
Britannica calls the cong a ritual utensil used in sacrificial and burial ceremonies, and notes that some examples are stone rather than jade. The Met is more cautious. The form is enigmatic. The museum still places these tubes in tombs and treats a protective job for the dead as a reasonable reading. World History Encyclopedia says cong and bi appear in large numbers as grave goods of the upper class. A tall multi-section tube is a prism you set or lay with the body, not everyday jewellery.
The corner masks stay unread. World History Encyclopedia notes that some Liangzhu jades already carry a zoomorphic mask that later writers call taotie, a motif usually tied to Shang bronze. The Met does not make that leap on 2004.52. It stays with eyes, bars, and a nose.
Shang copies and a later heaven-and-earth reading
Liangzhu did not invent the last word on the shape. Britannica says the form began in the late Neolithic and diminished after the Shang and Zhou dynasties. Its older clock prints Shang as the 18th to 12th century BCE and Zhou as 1111 to 256 or 255 BCE. World History Encyclopedia dates the Shang from 1600 to 1046 BCE. Later tubes still exist after those dynasties. The form is just thinner on the ground.
The turn is not a new tomb. It is a later idea. Later Chinese cosmology liked a square earth under a round heaven. Elizabeth Childs-Johnson and others, as World History Encyclopedia reports, read the cong as earth and the bi as heaven. The encyclopedia also prints the objection: there is no Liangzhu text that says so, and the earth-heaven motif is usually dated to the Shang and after. The reading is tempting. You cannot prove the carvers used it.
The Met's 25.4 cm cong, object 2004.52
One tall tube you can still study on a museum record is the Metropolitan Museum of Art's ritual object (cong), 2004.52. The collection page dates it about 2400 BCE, within Liangzhu, about 3200–2000 BCE. It is nephrite. It stands 25.4 cm high and 7 cm wide. The museum bought it in 2004 with a gift from Sir Joseph Hotung. The page currently lists it as not on view.
The curator text matches the type: square prism, circular bore, a gentle taper, simple masks at the corners. The audio walk-through calls it one of the largest and most complex surviving Neolithic Chinese jades, with columns of abstract faces so worn they nearly disappear. Eight to ten pounds. Too heavy for the wrist. The Chinese caption is 新石器時代良渚文化 玉琮. Against World History Encyclopedia's upper size note of about 30 cm by 15 cm, this Met piece is tall and slender, not a squat cong.
What the later books still cannot prove
Counts are soft. The Met audio says only a few from this period have survived. World History Encyclopedia speaks of large numbers in elite graves without printing a census.
The heaven-and-earth reading remains a later overlay. The masks remain unnamed. Britannica's sacrificial-and-burial line is a use class, not a liturgy. We do not have a Liangzhu sentence that says who the faces were, or whether a priest held the tube, or only the dead kept it. A jade cong is a Neolithic Chinese ritual tube, at its finest in Liangzhu, square outside and round within, often stacked with corner masks, buried with high-status dead beside the disk called a bi. Later dynasties copied the shape. Later books gave it a cosmos. The stone in the tomb does not confirm the book.
In your scene
A tall cong reads as a stacked ritual prism, not as a disk and not as a short jade bracelet. Keep the square exterior, the circular bore, and the low-relief masks at each corner of each tier. The Chinese Ritual Relics pack includes a stylised multi-section jade cong for tombs, altars, and court sets.