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]

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]

Tibetan Buddhist monks make 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]

Tibetan Buddhist monks make 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]

Tibetan Buddhist monks make 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]

Tibetan Buddhist monks make 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]

Tibetan Buddhist monks make 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]