The article examines the philosophy of thinker Charles Peirce on aesthetics and its role as a normative science. Normative sciences, according to Peirce, seek to examine the conditions of possibility for what ought to be with regards to feeling, conduct and thought. In particular, the formation of ideals and of the supreme ideal, the summum bonum, is studied through the science of aesthetics. Peirce claims that the ideal must be admirable in itself and must be conceived from the point of view of Firstness, as a quality of feeling or a habit of feeling.