Dizzyingly layered; demands to be re-read, but not until my head has stopped swimming.Whether you buy-in to Dick's religious/philosophical position or not, there's certainly lots to think about and, if you make it through to the end, it will stay with you for a long time.As is usual with PKD, there's much here about the nature and perception of reality and what it is to be human. There's a big chunk of auto-biography and painful honesty. Where PKD deals with characters, they are by turns funny, infuriating, warm, pitiful and frightening. There's also big chunks of religious and philosophical exposition (much of which went over my head, hence the need to re-read), so it's not a book I'd recommend for everyone. If you haven't read PKD before, it's probably better to start with something else and come to this in 5 to 10 book's time.