 Both realist and descriptivist category systems, at least as traditionally presented, seem to presuppose that there is a unique true answer to the question of what categories of entity there are – indeed the discovery of this answer is the goal of most such inquiries into ontological categories. Grossman, for example, argues that a list of categories must be complete, contain everything, with everything in its proper place (1983, 4). Johansson similarly takes his project as to “develop a coherent system of all the most abstract categories needed to give a true description of the world” (1989, 1). Arguments about which of the many systems of categories offered is correct likewise seem to presuppose that there is a uniquely correct list of categories.