If the knowledge argument for property dualism is not sound and thus untrue, because it rejects the possibility of future scientific explanations, then perhaps property dualism can be true because it is conceivable. The modal argument argues that because it is conceivable that a being with all of my physical properties but lacks my qualia to exist, and since what is conceivable is possible, and because a being that has all of my physical properties but does not have qualia is possible, then qualia must not be physical properties. It is clearly true that what is conceivable is