Liu Zheng, the fourth-generation successor of Zuoqiu leaf carving, seperate mesophyll and leaf veins from a leaf at his workshop in Zhengzhou, Central China's Henan province, March 30, 2016. Leaf carving is originated in Zhou Dynasty (1046 BC-256 BC). It has been listed as one of the provincial intangible cultural heritages of Henan in September of 2005. [Photo/Xinhua]