Eye in the Sky

Eight visitors touring a particle-accelerator facility are caught in a catastrophic malfunction, a collapsing platform, a burst of radiation, that leaves them all unconscious. When protagonist Jack Hamilton, an engineer recently fired over Red Scare-era suspicions about his wife's politics, comes to, the world around him is subtly, then not so subtly, wrong: physics bends to fit one fellow victim's religious convictions, then to another's paranoid fears, as the group cycles through what turn out to be shared hallucinations built from each other's private belief systems. Philip K. Dick's early novel about how differently people actually see the same world.