Once, Zhou had a dream that he became a butterfly - an unfettered butterfly that really could fly, and he felt so much joy and freedom! He had forgotten that he was Zhou. When he jolted awake in a daze, he remembered who he was. But he became uncertain whether Zhou had a dream about being a butterfly or a butterfly had a dream about being Zhou. Zhou and the butterfly are definitely not one and the same. So, which is the real one?

This is how things transform.