Wang Ziyong and his apprentices create inside painting works on the inside surface of snuff bottles at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province, Sept. 1, 2021. (Photos: Xinhua)

Photo taken on Sept. 4, 2021 shows the different stages of the inside painting creation at a museum featuring inside painting in Taocheng District of Hengshui City, north China's Hebei Province.

Wang Ziyong (R) directs an apprentices to create inside painting works at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province, Sept. 1, 2021.

Wang Ziyong creates inside painting works on the inside surface of a bottle at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province, Sept. 4, 2021.

Wang Ziyong creates inside painting works at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province, Sept. 4, 2021.

Wang Ziyong (R) introduces inside painting works at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province, Sept. 1, 2021.

Photo taken on Sept. 1, 2021 shows inside painting works at a museum featuring inside painting in Taocheng District of Hengshui City, north China's Hebei Province.

Photo taken on Sept. 4, 2021 shows inside painting works of Wang Ziyong at a museum featuring inside painting in Taocheng District of Hengshui City, north China's Hebei Province.

Wang Ziyong creates inside painting works on the inside surface of a bottle at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province, Sept. 4, 2021.

Wang Ziyong creates inside painting works at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province, Sept. 4, 2021.

Photo taken on Sept. 4, 2021 shows brushes used by Wang Ziyong to create inside painting works at a museum featuring inside paintings in Taocheng District of Hengshui City, north China's Hebei Province.