 Like Aristotle and Johansson, Roderick Chisholm presents his work on categories as being “about the ultimate categories of reality” (1996, 3). Unlike them, however, Chisholm (1996, 3) lays out categories in the form of a Porphyrian tree starting from a single most general category comprising everything, but divided into successively narrower genera at lower levels of branching. (For an interesting discussion of whether such general terms as ‘entity’ or ‘thing’ could be seen as naming a highest category, see Thompson 1957, cf. §2.3 below). Chisholm’s system of categories thus reads: