The cong occasionally appeared during the late Neolithic period (c. 2500 B.C.) in the Western Zhou, in western Shaanxi (Northwest China). One of the six ritual jades, it was among the most impressive and least understood of all ancient Chinese jades and never held any important position even at the end of the Zhou period.* Like the zhang, the cong did not have a long or continuous history. There are variations of cong. Based on appearance, there are two broad categories: cong that are relatively tall in proportion to their width and the shorter cong. Although the common design of the cong consists of a decorated (with distinctive taotie face designs) or undecorated tube with a square outer cross-section and a circular inner hole, brace...