A RARE WHITE JADE FOUR-TIERED ‘ANIMAL MASK’ CONG LIANGZHU CULTURE, CIRCA 3300-2300 BC The cong is of square cross section surrounding a cylindrically hollowed tube to the centre with rounded square corners, and tapers slightly from top to bottom. The sides are divided into four registers with a stylised mask at each of the four corners, comprising two long bars above a shorter bar and flanked by two incised circles. 5 ? in. (13.3 cm.) high, box