A Tibetan Buddhist monk makes a mandala with sand during a show of intangible cultural heritage from Regong art of Qinghai province in North China's Tianjin municipality, May 30, 2015. The creation of a sand mandala follows strict rules of proportion, structure, and content. Regong art includes paintings (murals and scrolls called "thangka " in Tibetan), clay and wooden sculptures, barbola, color paintings on buildings, patterns, and butter sculptures. [Photo by Zhang Daozheng/China News Service]