One day about sunset, Zhuangzi dozed off and dreamed that he turned into a butterfly.
He flapped his wings and sure enough he was a butterfly...
What a joyfull feeling as he fluttered about, he completely forgot that he was Zhuangzi.
Soon though, he realized that that proud butterfly was really Zhuangzi who dreamed he was a butterfly, or was it a butterfly who dreamed he was Zhuangzi!