People take photos as they watch a 3D light show projected on the building of the Historical Museum of Yunnan Military Academy in Kunming, southwest China's Yunnan Province, May 2, 2019. (Xinhua/Hu Chao)

Light is projected on the building of the Historical Museum of Yunnan Military Academy during a 3D light show in Kunming, southwest China's Yunnan Province, May 2, 2019. (Xinhua/Hu Chao)

People take photos as they watch a 3D light show projected on the building of the Historical Museum of Yunnan Military Academy in Kunming, southwest China's Yunnan Province, May 2, 2019. (Xinhua/Hu Chao)