 "Pure Speed" was a reasonable success, and this friendship would continue to strengthen until Klein's death as the two would develop their artistry, often in tandem with one another.After the extravaganza of "le Vide" eventually subsided, Klein's new found celebrity allowed him artistic endeavors based on commission, including the collaborative design, construction, and decoration of the Gelsenkirchen Opera House in West Germany.Klein seemed to have moved beyond the cramped confines of the Galerie Iris Clert