sentences:  Two trips to the United States in 1969 and 1973 were vitally important to his personal and artistic history; it constitutes, from photos, a repertory of forms, images, and notebooks of models.In 1974, he joined the legendary gallery of Aimé Maeght, where he would exhibit, including his Operas Glacés (Frozen Operas).In 1986, he exhibited at the 42nd Venice Biennale, and in 1992, he was the featured artist of the French Pavilion at the World Expo in Seville.