Eisenmann suggests that architecture must not only deal with static conditions of space and place or figure/ground contextualism and that architecture must rather deal with the problem of event and time. He rejects the idea of the Cartesian coordinate system such as in the straight extrusion from a plan and replaces it with the idea of the fold as presented in René Thoms catastrophe theory. The idea of the fold affects both plan and section thus breaking up the Cartesian order of space and, as Eisenmann argues, since the fold is both figure and ground it can be used as a way of projecting new social organizations into an existing urban environment.