At this moments in the book he calls it flying like a butterfly. Whenever Jean is happy or a good moment in the book. We think of a butterfly they are free to fly wherever they feel too. He is saying that his mind is a butterfly being free, and exploring different thoughts. He feels on top when he can talk to his family and other people in the hospital. The Butterfly is flying moving up to the sky. Sadly the book, has many up and downs of emotions, like the butterfly flight