 Russellian monism can be seen as combining three core theses: structuralism about physics, which states that physics describes the world only in terms of its spatiotemporal structure and dynamics; realism about quiddities, which states that there are quiddities, that is, properties that underlie the structure and dynamics physics describes; and quidditism about consciousness, which states that quiddities are relevant to consciousness. We will discuss these theses in  turn. 