[EN] In 1936 the Convegno Volta took place in Rome and it was dedicated to discuss the relationship between architecture and the figurative arts. Among the participants there was Le Corbusier, who presented a speech where he clearly establishes the fundamentals of the place of art in architecture, a key point in his later Synthèse des arts. After a manifesto of Modern Architecture, Le Corbusier states that in certain exceptional cases there can be “collaboration” between architecture and art, with the scope of “increasing human pleasure”. His attention is placed upon painting, sculpture and design; and as a response he proposes polychromy and “precise and mathematic points” where a “strong and worthy” artist can speak and let his discourse be felt. These places are communicative: “lieux porte-voix, porte-paroles, haut-parleurs”. Although inexistent then, they will be materialized years later in the way of the idea of the Synthèse des arts.