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Song about VALIS, is a science fiction novel by Philip K. Dick. It is an acronym for Vast Active Living Intelligence System, Dick's gnostic vision of God. Set in California during the 1970s, it draws from auto-biographical elements and inspiration from Dick's own investigations. In 1974, Horselover Fat (the alter-personality of Philip K. Dick) experiences visions of a pink beam of light that he calls Zebra and interprets as a theophany exposing hidden facts about the reality of our universe.