Left file photo shows a mother and her daughter in a slum in Lhasa before the democratic reform in Tibet in 1959. The upper right photo taken by Chogo on Feb. 5, 2018 shows girls of the Tibetan ethnic group playing on Barkor Street in Lhasa. The lower right photo taken by Jigme Dorje on Nov. 19, 2017 shows two sisters dressed in ethnic minority costumes playing in the field in a village of Puqu Township in Nyingchi.