Once, Zhuangzi dreamed he was a butterfly, but when he woke up, he wasn't sure whether he was Zhuangzi who had dreamt being a butterfly or if he was a butterfly now dreaming he was Zhuangzi.
庄子曾梦见自己化身为蝶，当他醒来，他分不清是自己刚刚梦见自己变成蝴蝶呢，还是蝴蝶正梦见它变成了庄子。