Sadako Sasaki was a young Japanese girl who became sick due to the atomic bombing of Hiroshima in 1945. After hearing the legend that if you fold 1000 paper cranes, a wish will be granted, Sadako started folding, using any pieces of paper she could find. Though Sadako wished to be well again, she died at the age of 12 from leukemia.
Since then Sadako and the paper crane has become a symbol for peace. Though folding a 1000 cranes is a huge project, the end result is beautiful.