A piece of hair embroidery work is seen in this picture taken on Dec. 5, 2015. Originating from Dongtai, located in Yancheng City of Jiangsu Province, more than 1,300 years ago, hair embroidery is one of the gems of ancient Chinese embroidery art, hailed as a "unique skill of the world." [Photo by Han Jiajun/China.com.cn]