 One may bring out this objection further by considering positions in philosophy which entail supervenience and yet deny physicalism. A good example is necessitation dualism, which is an approach that weaves together elements of both physicalism and its traditional rival, dualism. On the one hand, the necessitation dualist wants to say that mental facts and physical facts are metaphysically distinct—just as a standard dualist does. On the other hand, the necessitation dualist wants to agree with the physicalist that mental facts are necessitated by, and supervene on, the physical facts. If this sort of position is coherent, (1) does not articulate a sufficient condition for physicalism. For if necessitation dualism is true, any physical duplicate of the actual world is a duplicate simpliciter. And yet, if dualism of any sort is true, including necessitation dualism, physicalism is false.