In this thesis we carry out a critical analysis of the presence of idealistic ontologies in the Field of Design which, as far as we have been able to observe, is legitimized and reproduced in the means of consecration of knowledge (school benches) that propose to teach theories and foundations of design, especially on the use of colors. We offer for examination, firstly, what we call charismatic individualism, i.e., asking whether the designer would possess the innate ability to create something completely different from what already exists according to obscure gifts that are given by some inexplicable and ideal entity. Then, we propose the approach of what we call monist functionalism, which is the teaching of ideals based on fixed principles or foundations, as if they were true in all places and at all historical times. We affirm that the two notions are widely and widely disseminated in the Field of Design through their so-called theories, with little or no critical examination, and that they contribute to the alienation of students and professionals in the field, both those who work in academia and who exercise their profession in the labor market. Furthermore, we argue that when proposing the learning of these theories, it is very rare for a contradictory instruction that accepts and analyzes the concrete historical movement as a fundamental part of the study, in order to erase the sociocultural reasons that actually determine why we employ the configuration of this or that way. To do so, we will use concrete historical examples, both in the History of Philosophy and in the History of Design.