 In contrast to the constituent ontologies surveyed above, relational ontologies posit no internal structure to objects beyond ordinary mereological structure. Objects are not layer-cakes of thin particulars and properties (or layer-cakes of matter and form); they are blobs instead. Put this way, the blob view of objects has only negative content; it tells us what objects are not. It offers, then, a partial account of the nature of objects, and thus invites  supplementation.[31]