"Ornement is one of the most widespread forms of expression of art, but also the most neglected by criticism and historiography. However, it is present in all the arts and civilisations. Regarded as frivolous, superficial or unsuccessful, it is often regarded as ancillary or as a detail of the work of art. Rares is the theoretical work, since The sense of order (1979) by Ernst Gombrich, which has been devoted to him, apart of course from the research initiated by Marc fuma...