 As to the first sort of unity concerning the number of categories, some posit a categorical distinction between object and property, thereby recognizing a pluralism of at least two categories. But others would prefer the elegant monistic picture of a “one category ontology”: for instance, some trope theorists and property-only theorists claim a property-only schedule, or a schedule that effaces the object/property distinction (Williams 1953; Campbell 1990; Paul 2013); and eliminative nominalists claim an object-only schedule (Rodriguez-Pereyra 2002).