Wang Qingyu looks at one of his duplicated frescos in Balin Left Banner, Chifeng City of north China's Inner Mongolia Autonomous Region, Aug. 2, 2019. Wang Qingyu, a retired worker of a museum in Balin Left Banner, has been working for the duplicating of frescos of Liao Dynasty (916-1125 A.D.) for 40 years, and has altogether reproduced 50 plus precious frescos of Liao by far. (Xinhua/Peng Yuan)

Wang Qingyu guides an apprentice in depicting frescos at his studio in Balin Left Banner, Chifeng City of north China's Inner Mongolia Autonomous Region, Aug. 2, 2019. Wang Qingyu, a retired worker of a museum in Balin Left Banner, has been working for the duplicating of frescos of Liao Dynasty (916-1125 A.D.) for 40 years, and has altogether reproduced 50 plus precious frescos of Liao by far. (Xinhua/Peng Yuan)

Wang Qingyu guides apprentices in depicting frescos at his studio in Balin Left Banner, Chifeng City of north China's Inner Mongolia Autonomous Region, Aug. 2, 2019. Wang Qingyu, a retired worker of a museum in Balin Left Banner, has been working for the duplicating of frescos of Liao Dynasty (916-1125 A.D.) for 40 years, and has altogether reproduced 50 plus precious frescos of Liao by far. (Xinhua/Peng Yuan)

Wang Qingyu guides apprentices in depicting frescos at his studio in Balin Left Banner, Chifeng City of north China's Inner Mongolia Autonomous Region, Aug. 2, 2019. Wang Qingyu, a retired worker of a museum in Balin Left Banner, has been working for the duplicating of frescos of Liao Dynasty (916-1125 A.D.) for 40 years, and has altogether reproduced 50 plus precious frescos of Liao by far. (Xinhua/Peng Yuan)

Wang Qingyu introduces the skills of duplicating frescos at a museum of Balin Left Banner, Chifeng City of north China's Inner Mongolia Autonomous Region, Aug. 2, 2019. Wang Qingyu, a retired worker of a museum in Balin Left Banner, has been working for the duplicating of frescos of Liao Dynasty (916-1125 A.D.) for 40 years, and has altogether reproduced 50 plus precious frescos of Liao by far. (Xinhua/Peng Yuan)