 A second argument for Russellian monism is based on the claim that this theory offers an elegant, unified solution to two distinct philosophical problems (Lockwood 1989, 1992; Chalmers 1996, 2013 [2015: 254]; Rosenberg 2004; Goff 2017; cf. Russell 1927a, 1927b: 116). One of those problems is how to provide a foundation for the spatiotemporal structure physics describes. The other is how to integrate consciousness into physical causation. When considered from the perspective of a Russellian monist, these two problems seem made for each other. The requisite foundation of spatiotemporal structure is provided by (proto)phenomenal quiddities. Because those same quiddities (partly or wholly) constitute consciousness, consciousness thereby plays a distinctive role in physical causation—or at least the components of consciousness play that role. Thus, the reasoning runs, both problems are solved at once.