Liángzhǔ Wénhuà de mùzàng lǐ chūtǔ le dàliàng yùcóng.
Large numbers of jade cong have been dug up from the graves of the Liangzhu culture.
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culture
The shape is often read through the old belief that heaven is round and earth is square: in Zhou ritual the 璧 disc honoured heaven and the 琮 earth. The oldest and finest come from the Liangzhu culture of the lower Yangtze, about 5,000 years ago.