Traveling through time has been a reoccuring idea all throughout the book. The fact that Billy believes he is time traveling shows that the plane crash he was in really messed up his mind. In the media, time traveling has been something really cool to produce movies, books, etc. about from Disney movies like
Minutemen, animated movies like
Meet the Robinsons, and of course, in science fiction books like Michael Cricton's
Timeline. All of these were entertaining to watch and or read, but if we were to hear about it in real life, we would simply think of the stories as crazy and incredulous, but in the fictional world, we find these stories creative and imaginable. Billy time travels almost constantly throughout the book, making it quite hard to follow, but eventually the stories start to become familiar and you begin to realize that you are tracing his life, just in a different pattern.
