 The theory of the proposition is thus caught in a circle, with each condition in turn being conditioned by what it supposedly conditions. “For the condition of truth to avoid this defect,” Deleuze argues, “it would have to have something unconditioned capable of assuring a real genesis of designation and the other dimensions of the proposition: the condition of truth would then be defined, no longer as the form of conceptual possibility, but as an ideal matter or ‘medium’ [matière ou ‘couche’ idéelle], that is, no longer as signification, but as sense” (LS 19). Sense, then, would be a fourth dimension of propositions, for which Deleuze reserves the term expression. For Deleuze as for Frege, sense is what is expressed in a proposition; the two senses of “morning star” and “evening star” are two ways in which the same denotatum may be expressed in propositions.