Wow, this was unlike anything I've ever read before! And that is high praise in it's own right!
I'm not even really sure what I'm going to write in this review because, to me, there is no explaining what was so amazing about this book - all I can think is that Ms. Thomas has an absurd (in the very good sense of the word) imagination and that she somehow manages to take a quite complex and very odd subject and make it as if it's really no issue to explain.
I think the best thing any reader can do for themselves is to just go along with this book - even if you don't understand everything about the "mechanics" when they're first introduced, it doesn't really matter. It's very Alice-in-Wonderland: slide along down the rabbit hole and wonders will assail you - no need to worry the why and whetherfors.
That being said, I really do think that Thomas manages to give credibility to her imaginings, I just mean that she is so skillful at telling the story that you shouldn't worry if you don't get it right away.