A third argument for Russellian monism is based on the claim that Russellian monism provides a plausible response to anti-materialist arguments such as the conceivability argument and the knowledge argument (see the entries zombies and qualia: the knowledge argument and Alter 2017). The conceivability argument is often formulated in terms of a zombie world (Chalmers 1996): a physical and functional duplicate of the actual world but without consciousness. It is first argued that a zombie worl