What's happening, butterfly?

Once upon a time, I dreamt I was a butterfly, fluttering hither and thither, to all intents and purposes a butterfly. I was conscious only of following my fancies as a butterfly, and was unconscious of my individuality as a man. Suddenly I awoke, and there I lay, myself again.. Now I do not know whether I was then a man dreaming I was a butterfly, or whether I am now a butterfly, dreaming that I am a man.

- Chuang-Tzu, 3rd century BC