Zhuangzi was a philosopher whose writings are still famous for their deep and influential thoughts. The following is one of the most famous stories he tells, questioning the concept of reality and mind:
One day I dreamt that I was a butterfly, flying freely and doing what I pleased, without knowing that I was Zhuangzi.
But when I woke up, I was Zhuangzi without a doubt.
So did Zhuangzi dream of being a butterfly, or am I a butterfly dreaming of being Zhuangzi?