In this paper I will explore the ways in which rational formulations can approach the "visual universe" and confront it in relation to the aesthetical domain. I will consider visual objects as semiotic entities in order to handle them as sign-functions (not only terminology, but many of the ideas of this essay were based on the work of Umberto Eco). Furthermore, I will take into account the form in which these sign-functions are coded and the rationalization of this process in connection with the sets of rules that are provided by different aesthetic codes.