The paper argues that Jackson's knowledge argument fails to undermine physicalist ontology. First, it is argued that, as this argument stands, it begs the question. Second, it is suggested that, by supplementing the argument (and taking one of its premises for granted), this flaw can be remedied insofar as the argument is taken to be an argument against type-physicalism; however, this flaw cannot be remedied insofar as the argument is taken to be an argument against token-physicalism. The argument cannot be supplemented so as to show that experiences have properties which are illegitimate from a physicalist perspective.
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