A second Purist exhibition was held at the Galerie Druet, Paris, in 1921 in which Ozenfant again exhibited. In 1924 he opened Académie Moderne, a free studio in Paris with Fernand Léger, where they both taught with Aleksandra Ekster and Marie Laurencin. Ozenfant and Le Corbusier wrote "La Peinture moderne" in 1925 and in 1928 Ozenfant published "Art", which was subsequently published in English as "The Foundations of Modern Art" in 1931. In this he fully expounds his theory of Purism, and it is remarkable for its idiosyncratic and aphoristic style.