 The problem that property dualism presents for token physicalism is noteworthy in several respects. For one thing, it is similar to the problem necessitarian dualism presents for supervenience physicalism, though necessitarian dualism can itself be developed either as a sort of property dualism or as a sort of substance dualism. For another thing, it brings out the important role properties rather than particulars play in the contemporary discussion of physicalism. If one ignores properties, the dispute between physicalism and dualism may easily be understood as the dispute between token physicalism and substance dualism; but once properties are factored in, things look very different.