Jade articles (or products) appears at Liangzhu culture (良渚文化) at ca 3300BC, which is rice crop agriculture in paddy field in the lower Changjiang (長江). Jade articles are jade disc (玉壁), jade cube (玉〓), jade decorates, etc. They are made by high level technique, especially by potter's lathe (轆轤), which revealed at Liangzhu culture for the first time, and developed turning lathe (施盤) at Industrial Revolution.
