The controversy of ornament - familiar to us by the works of art historian Alois Riegl and Adolf Loos's famous pamphlet, as well as the positions taken by artists of modernism and minimal art - has long story. The Preliminary Concepts for a Karl Karl Moritz Ornamentation Theory, written in 1793, is a decisive step. Written by one of the supporters of the Klassik, heir to Winckelmann and Herder, whose influence on Goethe is well-known, the book is astonishing in its empirical investigation and its practice of description. A theory of ornaments and not of ornament is constructed in the study of motifs, the knowledge of the productions that a long journey in Italy and the observation of the mansions of Berlin have procured for the author. Moritz shows that the thought of ornamentation is a centerpiece of aesthetic reflection on beauty.