Wang Rubin (4th L), inheritor of Nuo mask making, shows mask carving techniques to students at Enshi Polytechnic in Enshi Tujia and Miao Autonomous Prefecture, central China's Hubei Province, June 18, 2019. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in many Chinese provinces. Inheritors of Nuo mask making have been invited as tutors to instruct students on mask making techniques at Enshi Polytechnic. (Xinhua/Yang Shunpi)