" Once Zhuang Zhou dreamed he was a butterfly. A butterfly fluttering happily around— was he revealing what he himself meant to be? He knew nothing of Zhou. All at once awakening, there suddenly he was — Zhou. But he didn't know if he was Zhou having dreamed he was a butterfly or a butterfly dreaming he was Zhou. Between Zhou and the butterfly there must surely be some distinction. This is known at the transformation of things. "

― Zhuangzi , Chuang Tsu: Inner Chapters