A butterfly-shaped paper-cut ring is pictured during the opening of the China·Time Memory Exhibition in Britain held in London, Aug. 17, 2017. (Xinhua/Han Yan)

Artist Liu Yanshan (L) introduces paper-cuttting during the opening of the China·Time Memory Exhibition in Britain held in London, Aug. 17, 2017. (Xinhua/Han Yan)

Artist Liu Yanshan makes paper-cutting during the opening of the China·Time Memory Exhibition in Britain held in London, Aug. 17, 2017. (Xinhua/Han Yan)

A guest flies a kite indoors during the opening of the China·Time Memory Exhibition in Britain held in London, Aug. 17, 2017. (Xinhua/Han Yan)

Children hold kites during the opening of the China·Time Memory Exhibition in Britain held in London, Aug. 17, 2017. (Xinhua/Han Yan)

A butterfly-shaped paper-cut ring is pictured during the opening of the China·Time Memory Exhibition in Britain held in London, Aug. 17, 2017. (Xinhua/Han Yan)

Saibei clay figurines are seen during the opening of the China·Time Memory Exhibition in Britain held in London, Aug. 17, 2017. (Xinhua/Han Yan)