500
How was Sadako Sasaki important to Origami Cranes? What did she help them symbolize?
After the bombing of Hiroshima Sadako Sasaki developed leukemia and decided to make a 1000 cranes. After her passing, her classmates started a campaign to memorialize her and other victims of the nuclear bombs. This started a worldwide movement of paper cranes for peace, a symbol of the need to end and disarm all nuclear weapons.