 Daniel Stoljar (2001), Derk Pereboom (2011, 2015), and Barbara Montero (2015) have interpreted Russellian monism (see section  5.5)  as a form of physicalism. They argue that the categorical properties that ground the dispositional properties that feature in physical theory are themselves physical properties, albeit physical properties of a different kind. Once the realm of the physical is thus expanded, the attempt to classify the categorical bases of the dispositional properties of physics as neutral properties appears misguided. The proposal to construe the categorical bases as neutral results from an unduly narrow conception of the physical.