Thangka paintings displayed at art collection expo in Lanzhou, NW China's Gansu

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A man views thangka paintings during an art collection expo at Gansu international conference and exhibition center in Lanzhou, northwest China's Gansu Province, April 12, 2018. Over 50 thangka paintings were displayed at the expo that kicked off on Thursday. (Xinhua/Fan Peishen)

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A man takes photo of thangka painting during an art collection expo at Gansu international conference and exhibition center in Lanzhou, northwest China's Gansu Province, April 12, 2018. Over 50 thangka paintings were displayed at the expo that kicked off on Thursday. (Xinhua/Fan Peishen)

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A thangka painter works during an art collection expo at Gansu international conference and exhibition center in Lanzhou, northwest China's Gansu Province, April 12, 2018. Over 50 thangka paintings were displayed at the expo that kicked off on Thursday. (Xinhua/Fan Peishen)

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People view thangka paintings during an art collection expo at Gansu international conference and exhibition center in Lanzhou, northwest China's Gansu Province, April 12, 2018. Over 50 thangka paintings were displayed at the expo that kicked off on Thursday. (Xinhua/Fan Peishen)