In this file photo taken on Sept. 16, 2016, children enjoy themselves in a foam activity in a tourist resort in southwest China's Chongqing. As China celebrates the International Children's Day, there arises the occasion for grown-ups to think back over the joys of childhood. With the evolution of technology and lifestyle, children are exposed to a wider range of entertainment. Nevertheless, joy would remain a childhood motif no matter how its forms change with time. (Xinhua/Zhang Yi)