Hu Xinyu, 7, performs "Bian lian" for her classmates ahead of the International Children's Day, at a primary school in Shenyang, Liaoning province, May 30, 2013. Sichuan Opera, well known for Bian lian, or "face-changing" where performers change masks in quick succession with a wave of the hand or by turning around, is one of the oldest forms of Chinese opera. [Photo/Agencies]