Students of Chen Jianqing learn to make paintings on silkworm cocoons in Tongxiang, east China's Zhejiang Province, May 8, 2014. Chen Jianqing, an art teacher with Fengming High School in Tongxiang, began to create unique paintings on silkworm cocoons several years ago. After trying hundreds of times, Chen has worked out techniques of cocoons antiseptic and multi-colors sustainability. (Xinhua/Xu Yu)