Orizuru was invented in the Edo period as a game for children. In Japan, the crane is a symbol of good luck and longevity. That`s why it is said that if you fold one thousand origami cranes you won`t get sick anymore and will live a long life. Sadako Sasaki, the child who folded a thousand of them, became a symbol of innocent victims of war. She was two years old when the atomic bomb was dropped on Hiroshima and few years later she developed leukemia. Hoping to recover from her disease, she folded a thousand cranes and was remembered through her story.