That response can be developed in different ways, such as rejecting epistemic premises on which the anti-materialist arguments rely (for other ways, see Chalmers 2010: 134–35; Pereboom 2011; Alter and Nagasawa 2012: 83–86). Regarding the conceivability argument, Russellian physicalists can argue as follows. On reflection, a zombie world is not ideally conceivable. If such a world initially appears conceivable, this is because we mistake a zombie world for a structural zombie world: a consciousne