A worker sands a brick for carving at a brick carving company in Linxia County of Linxia Hui Autonomous Prefecture, northwest China's Gansu Province, May 31, 2019. Linxia brick carving is one of the traditional folk arts in Linxia, which became a mature artistic form and prospered during the Ming (1368-1644) and Qing (1644-1911) dynasties. It was listed in 2006 as one of China's national intangible cultural heritages. (Xinhua/Chen Junqing)