ABSTRACT
Psychology is concerned with space, not as a system of relations among material objects, but as a feature of our perceptions. If we could accept naïve realism, this distinction would have little importance: we should perceive material objects and their spatial relations, and the space that characterizes our perceptions would be identical with the space of physics. But in fact naïve realism cannot be accepted, percepts are not identical with material objects, and the relation of perceptual to physical space is not identity. What the relation is, I shall consider presently; I am concerned, to begin with, only with space as it appears in psychology, ignoring all questions of physics.
