A similar brushpot in the Hong Kong Museum of Art, signed Sansong, is illustrated by Ip and Tam, Chinese Bamboo Carving, part I, pl. 37 and col. pl. 15, who discuss the work of Zhu Zhizheng, active in the first half of the seventeeth century, part II, p. 61-62. Other brushpots with the same signature are illustrated in Masterpieces of Chinese Writing Materials in the National Palace Museum, pl. 22 and by Jenyns and Watson, Chinese Art, The Minor Arts, pl. 200