Ubik

*Ubik* is a science fiction novel by Philip K. Dick that explores themes of reality, perception, and consciousness. In the story, a future society uses psychic abilities for business and espionage, but the line between reality and illusion often blurs. The concept of Ubik itself is a mysterious, omnipresent substance that seems to maintain or alter perceptions of reality, providing a sense of stability in a world that frequently shifts between different states of existence and decay. It raises questions about what is genuine and the nature of reality itself.