Cai Shuikuang (1st L), a lacquer thread sculptor, teaches his students lacquer thread sculpture in Xiamen, East China's Fujian province, Aug 4, 2017. Lacquer thread sculpture is an art in East China which uses well-tempered lacquer threads to build decorative patterns. Originated in the mid-17th century, lacquer thread sculpture is listed as one of China's national intangible heritages. [Photo/Xinhua]