The story of the paper crane - a symbol of peace and hope - is inevitably entangled with Sadako Sasaki. Sadako was exposed to irradiation during the Hiroshima bombing at the age of 2. She was still able to live for another 10 years, making the sports team of her school, until leukemia was diagnosed. Her best friend told her of an old Japanese legend, which says that the gods will grant a wish to whoever folds 1000 origami cranes. Sadako kept folding paper cranes until her death and was buried with them. The children's peace monument was built in her remembrance and in remembrance of all victims to Hiroshima.