The new campus was going to become a vast urban complex of about 200 hectares and included 40 buildings. Villanueva worked with 28 avant-garde artists of the time, from Venezuela and the rest of the world, to build what continues to be one of the most successful applications of Modern Architecture in Latin America. Villanueva's guiding principle was the creation of a space where art and architecture cohabited in harmony in a "Synthesis of Arts". Among some of the most important pieces present in the university are the 1953 "Floating Clouds" by Alexander Calder, murals by Victor Vasarely, Wifredo Lam, Fernand Léger and sculptures by Jean Arp and Henri Laurens. The "Ciudad Universitaria de Caracas" was declared World Heritage by UNESCO, and it is the only modern university campus designed by a single architect to receive such high honor.