 Late medieval Nominalists, like Ockham and his followers, drew a distinction between things as they exist in the extra-mental world and the schemata by means of which we think of and talk about them. While the world consists only of two genera of individuals, substances and qualities, the concepts by which they are grasped and expressed are universal and of ten different types. Nor do the relations through which we connect our notions in a proposition analytically correspond to the real links that join individuals in a state of affairs. Thus, our conceptual forms do not coincide with the elements and structures of reality, and our knowledge does not reproduce its objects but merely regards them.