Vessels of this type represent foreigners of various ethnic types, demonstrating the diversity and cosmopolitan nature of the population of Tang dynasty China. A closely related vessel in the shape of a foreigner with mustache and combed hair was found in the tomb of Duan Boyang, dated to the second year of Qianfeng (667), illustrated in the Zhongguo chutu ciqi quanji (Complete Collection of Ceramic Art Unearthed in China), Beijing, 2008, vol. 15: Shaanxi, p. 22.