In 1946, his first abstract paintings were featured at the "Salon des moins de 30 ans" exhibition in Paris. He founded the first artistic group "L’Imaginaire" with Wols, Jean-Michel Atlan, Hartung, Bryen, Riopelle and exposes with fourteen painters at the "Galerie du Luxembourg" on 16 December 1947. The exhibition was called "Towards Lyrical Abstraction", but the title was later changed because of the presence of works of Pablo Picasso and Jean Arp. The same year, he exposes at the "Salon des Réalités Nouvelles" and at the "Salon des Surindépendants".