Taoist Story - Dreams

Chuang Tzu, ancient Chinese Taoist, once experienced a dream in which he was a butterfly fluttering to & fro. In the dream he had no awareness of his individuality as a person; he was simply a butterfly. Suddenly, he awoke and found that once again he was a human laying in bed. But then he thought to himself, "Was I before a man who dreamt about being a butterfly, or am I now a butterfly who dreams about being a man?"