1 Either the claim that physical objects are capable of having mental properties or that all spiritual objects have mental properties would be debateable. Just as some dualists might deny that physical stuff is capable of having mental properties, so some physicalists would be happy to accept the existence of spiritual stuff lacking mental properties e.g. ‘ectoplasm’.
2 Admittedly, universals like ‘blueness’ can be instantiated in the world, but if anything like an actual object ‘the blue’ exists it is not.
3 Interestingly, Hoffman and Rosencrantz are dualists, and usually dualists cite the possibility of ghosts as proof of the existence of souls. Their replying in this manner would be coherent but unusual.
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