Eisenman rejects the model of Cartesian space due to the manner in which it discreetly divides space in a regimented uniform way, since that might in turn also imply that the matter represented therein should also maintain the same uniform consistency within its own fabric and construction. Space is framed within the Cartesian plane, and thereby susceptible to false contextualization. He rejects this model because it can not account for continual variation. He calls this concept the 'fold', as coined by Deleuze, in order to depict the sense of variation and inconsistency of density that can occur in space, whether that be material space, such as terrain, temporal space, such as the human experience of physical space, or some combination of the two, such as the urban fabric.