The Taoist classic featuring Zhuang Zhou’s famous dream of being a butterfly is the Zhuangzi.
The story appears in the opening section of the text. Zhuang Zhou dreams that he is a butterfly, enjoying its existence without knowing he is Zhuang Zhou. When he awakens, he wonders whether he is a man who dreamed of being a butterfly or a butterfly dreaming of being a man.
The passage illustrates themes central to the Zhuangzi, including changing perspectives, uncertainty about fixed distinctions, and the limits of ordinary human knowledge. It is often called the “Butterfly Dream” or “Butterfly Dream Debate.”
The Zhuangzi is traditionally associated with the philosopher Zhuang Zhou, also known as Zhuangzi, who is generally dated to the 4th century BCE. The received text contains 33 chapters, though scholars distinguish older inner chapters from later material.