 We can view ‘Stuff Ontologies’ as views which, in some sense, depart from this picture and ‘take stuff seriously.’ That is, a Stuff Ontology is any view which departs from Thing Theory in important respects so as to allow non-thing-like stuff to be part of the fundamental furniture of the world, whereas Thing Theorists believe that stuff-talk modeled on mass term use has no proper place in the fundamental correct description of the world.