Just when I thought I may be quicker than the characters and know what's going on, the dimensions shift, and i'm enthralled again--a new reality at every turn just when you thought your hypothesis was going so well. Definitely a wild read for those who like an element of uncertainty in their scifi. Dick is notorious for debating real vs not real in his work--figures, he was a schizo meth addict. It was a pleasure to have him for required reading for a scifi class.