“Ornament and Crime” is the most important work by the Viennese architect Adolf Loos, and one of the sources of the concept of uncluttered architecture. This manifesto seems to be opposed to the eclecticism characteristic of the art of the Second Empire, the Third Republic and to Art Nouveau. It promotes simplicity, geometry and structural coherence: the form must express the function of the building, without superfluous ornamentation. Ornamentation is considered an economic crime because of its price and supposed uselessness. However, Loos' position is described in the 21st century as more nuanced: while it was indeed a question of rejecting ornamental excess, decoration was not rejected as such; on the contrary, Loos sought “the decoration most appropriate to civilised man” and defended the idea of a formal purity characteristic of the “new man of taste”. Architects like Loos and Le Corbusier were deeply hostile to the conventional notion of the home, which they associated with 'sentimental hystericism and dusty conservatism'.