Derrida does not assert the possibility of thinking outside such terms; any attempt to undo a particular concept is likely to become caught up in the terms which the concept depends on. For instance: if we try to undo the centering concept of ‘consciousness’ by asserting the disruptive counterforce of the ‘unconscious’, we are in danger of introducing a new center. All we can do is refuse to allow either pole in a system to become the center and guarantor of presence.