 Daniel Warren clarifies this argument in an especially helpful way (Warren 1998; cf. Allison 2004, 100–104). Certainly, it is not true in general that in any order to represent any two entities, A and B, as related in some way, I must represent them as falling into a larger “space” of some relevant character. Warren gives a useful example: in order to represent A as “brighter than” B, I need not represent A and B as being part of a larger “brightness” space. I could do so: I could represent A and B via the “brightness” relation precisely by representing A as lying at one end of a brightness spectrum, and B as lying near its other end. But I need not do so: I could simply represent A and B themselves, and represent A as brighter than B, as I might do with two lights (Warren 1998, 200ff). The suggestion is that in order to represent A and B as bearing a spatial relation with one another—say, to represent them as being some distance apart—I must represent A and B as in space. In that sense, the representation of objects as spatially related may presuppose the representation of space. The problem for Locke is that he begins with my perception, or idea, of a distance between two objects, and then proceeds to construct my idea of space from that initial point. But if my representation of a distance relation between any two objects already presupposes a representation of those objects as in space, then the former cannot be the beginning point of a process that issues in the latter.