 One well-known physicalist reply to the case of zombies (Loar 1990) is to grant that they are conceptually possible, or at least that there is no obvious contradiction in the idea of a zombie, while denying that zombies are metaphysically possible. Since the anti-physicalist argument requires metaphysical possibility — mere conceptual possibility will not suffice — it now collapses. That conceptual possibility is too weak for the anti-physicalist’s purposes (at least without further qualification and argument) is shown by the fact that it is conceptually possible that I am not Michael Tye (that I am an impostor or someone misinformed about his past) even though, given the actual facts, it is metaphysically impossible.