This unique and elegant vessel is reminiscent of stoneware and ceramic water-pouring vessels of the earlier Song and Yuan periods. Compare the shape with a Yuan dynasty blue and white ceramic example in the Anhui Provincial Museum collection, illustrated in Underglaze Blue and Red, (ed.) Wang Qingzheng, Shanghai Museum, 1987, no. 17. It has been mentioned that the ceramic form was a prototype of earlier washers that were made of bronze, silver or lacquer, ibid., p. 235.