A jade cong, Neolithic period, Liangzhu culture 新石器時代良渚文化 獸面紋玉琮 of short cylindrical form with a square cross-section, the sides divided into two registers, carved with a pair of confronting stylised human masks at each corner, each mask comprising two horizontal striated bars above a shorter oblong bar forming the nose and two faintly incised circles forming the eyes h. 4.7 cm