In a 1968 essay titled "Self Portrait", collected in the 1995 book "The Shifting Realities of Philip K. Dick", Dick reflects on his work and lists which books he feels "might escape World War Three": "Eye in the Sky", "The Man in the High Castle", "Martian Time-Slip", "Dr. Bloodmoney, or How We Got Along After the Bomb", "The Zap Gun", "The Penultimate Truth", "The Simulacra", "The Three Stigmata of Palmer Eldritch" (which he refers to as "the most vital of them all"), "Do Androids Dream of Electric Sheep?", and "Ubik". In a 1976 interview, Dick cited "A Scanner Darkly" as his best work, feeling that he "had finally written a true masterpiece, after 25 years of writing".