In Japanese mythology, folding a thousand paper cranes grants you a wish. The Hiroshima Peace Memorial can be found wreathed in millions of paper cranes at any time of the year. In China, paper cranes also grace hospitals, schools, and sites of disaster, as the equivalent of a candle lit in prayer.
More recently, Chinese Weibo users decided that classic origami was a smidge too solemn for its own good and needed a bit of an upgrade. This became a meme: