 A metaphor of Saul Kripke’s helps to show how the zombie idea threatens physicalism (Kripke 1972/80, 153f.). Imagine God creating the world and deciding to bring into existence the whole of the physical universe. Having created this purely physical universe, did he have to do any more work to provide for consciousness? Answering yes to this question implies there is more to consciousness than the purely physical facts alone can supply. If nothing else, it implies that consciousness depends at least partly on nonphysical properties, ones that would not exist in a purely physical world; it would be a zombie world. Physicalists, on the other hand, are committed to answering no. They have to say that by fixing the purely physical facts, God did everything that was needed to fix the mental facts about the organisms thereby created, including their thoughts, feelings, emotions, and experiences. And if fixing the physical facts is alone enough to fix the mental facts, then it seems that a zombie world is impossible.