Sign, sense, and event, which are studied in the chapter about the preposition in the book Logic of Sense by Gilles Deleuze. The main purpose is to analyze the relation between sign and sense, arisen through their expression as event. In order to value the sense, in the expression of a chain of signs, I will study it from two perspectives: on one hand, as the fourth dimension of sign, in relation with three traditional dimensions (manifestation, meaning and designation). On the other hand, as an event in its expression through the sign. In order to meet my goal, my paper will be divided in three parts: the first part is going to present considerations about the concept of sign from the joint presented for its three traditional dimensions, denominated as the proposition circle, which defines the basic topics of every semiotic study: language (manifestation), thought (significance) and reality (designation). The second part is going to examine the sense, as the fourth dimension of the proposition, which allows seeing its traditional circle and configuring a semiotic analysis model. It is important to say that this model is paradoxical because it exposes the sign in different ways: as an element in the set of the four elements of the proposition, and as set in the proposition, which moderates all its elements. The last part is going to explain the event as an expression of the sense through of the proposition, from the frontier of the relation, which it establishes between language (Self) and the reality (World).