An artist paints on a porcelain in a workshop in Wudi County, east China's Shandong Province, Nov. 28, 2017. Wudi County is the birthplace of shell porcelain. With the cooperation of a dozen of schools and hundreds of artists, the shell porcelain became popular in the market. (Xinhua/Zhu Zheng)

Workers pour slurry into moulds at a workshop in Wudi County, east China's Shandong Province, Nov. 28, 2017. Wudi County is the birthplace of shell porcelain. With the cooperation of a dozen of schools and hundreds of artists, the shell porcelain became popular in the market. (Xinhua/Zhu Zheng)