A boy visits Trick Eye, an interactive 3D museum in Hong Kong, south China, May 26, 2017. This year marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Liu Yun)
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A boy visits Trick Eye, an interactive 3D museum in Hong Kong, south China, May 26, 2017. This year marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Liu Yun)
