 Importantly, any given theory of the source of social categories can take different positions on the topics discussed in  section 3—i.e.,  on what the constituents or building blocks of social entities are. A set of theorists might disagree about how cha-chas (or other social entities, or entities in general) are constituted—e.g., by people, or patterns, or physical configurations of atoms, or sensible particulars, or impressions, etc. And yet all might agree that a person’s categories are set up by that person’s own mental states (compare, for instance, Berkeley 1710, Russell 1929, and Dennett 1991). Conversely, a set of theorists might all agree on how cha-chas are constituted, yet disagree on what metaphysically sets up that category.