Cassia-tree moon

Wu Gang was a magician who attempted to use his Taoist magical powers to gain immortality. He was condemned to cut a 500 foot cassia (katsura) tree on the moon. He was told that if he could succeed in chopping down the tree he would be granted immortality. The tree, immortal itself, immediately grew back once cut. This tale (there are several versions) is still told today to chinese children during the Moon Festival.