Sense is always an effect but it requires two causes to acquire autonomy. The first cause is corporeal, from bodies, states of affairs and mixtures. The second cause is incorporeal, metaphysical, coming from the paradoxical element, the empty square, nonsense, or an aleatory point which circulates between the series of things and the series of propositions.Sense has two aspects: 1. It's impassible and sterile in relation to bodies and things while neutral in relation to language. 2. Sense gets produced. Sense engenders the dimensions of the proposition: signification, manifestation and denotation. The two aspects of sense sets up a problem. If sense is impassible, how does it get produced to engender the proposition? The problem = how to produce sense, or how does sense get produced? Deleuze needs and begins to set the groundwork for a transcendental field for the bestowal of sense. The problem raised by the two aspects of sense indicates a choice between Formal Logic and Transcendental Logic. One way Deleuze states this problem: "At the heart of the logic of sense, one always returns to this problem, this immaculate conception, being the passage from sterility to genesis."