The butterfly dream appears in the Zhuangzi, a foundational Daoist text associated with Master Zhuang, or Zhuang Zhou. It is a short philosophical passage, not a report that the historical author believed he physically transformed into an insect.
The dream
Zhuang Zhou dreams he is a butterfly, happily unaware of being Zhuang Zhou. On waking, he is plainly Zhuang Zhou again. The passage asks whether Zhou dreamed he was a butterfly or a butterfly now dreams it is Zhou.
Transformation and distinction
The text adds that there must be a distinction between Zhou and the butterfly, and calls this the transformation of things. The point is not simply that reality is fake. It unsettles confidence in perspective, identity, waking knowledge, and fixed boundaries while retaining difference.
The Zhuangzi as a layered work
The received book contains material from more than one writer and period. The butterfly passage belongs to the Inner Chapters, traditionally linked most closely with Zhuang Zhou. Later art and popular quotation often isolate it from the broader chapter’s discussion of changing viewpoints.