Unearthed in Mount Wutai, Yangzhou city in 1958, this mortar in a decorous shape was a very practical vessel in ancient times. It has an opening that tapers at the upper end, slightly expanded shoulders, a bulging belly and a flat bottom. The area from opening to lower belly is covered with naturally-mixed glaze in four colors, yellow, green, white and brown, creating a brilliant visual effect. Traces of flowing glaze do not reach the bottom, exposing part of the white body, which is smooth, solid and heavy.