The Germans turned to visionary paper architecture after World War I. One example is the Bruno Taut design for the Cosmic Carousel in 1920, a spherical structure with radar-like propellers. Antonio Sant'Elia was an influencer of the futurism movement in Italy; although most of his work was on paper and was never built. He designed mountainous buildings with bridges and towers connecting spaces. Russian constructivism also emerged after World War I, and leaned toward "openwork, pavilion-like structures with strident placards and public-address systems." Russian constructivist designs relate to 18th-century visionary architectural designs in "the overt symbolism of their various elements" and a tendency toward immense buildings. One outstanding example of this style is the Vesnin brothers' design for the Palace of the Soviets, with its immense size and mechanization through projections at each level. Another example, also by the Vesnin brothers, was the proposed building for Pravda covered in signboards and news communication instruments. In addition, Vladimir Tatlin designed a monument for the Third International or Communist International, a tall rotating spiral that wraps around Vera Mukhina’s Monument to Worker and Farmer. Tatlin's design recalled the metaphor for the Russian Revolution as a spiral. In 1960, Arthur Drexler curated an exhibit at the Museum of Modern Art in New York City that showcased the designs of visionary architects. Drexler not only gave a name to visionary architecture, but he also called attention to the importance of this work. He organized the exhibit based on three themes: geometry, mountains and caves, and roads or bridges. The exhibition included architectural drawings of Le Corbusier, Louis Kahn, William Katavolos, Frederick John Kiesler, Hans Poelzig, Paolo Soleri, and Michael Webb. The Metropolitan Museum of Art hosted the "Visionary Architects" exhibit in 1968. Jean Adhemar and J. C. Lemagny of the Bibliothèque Nationale de France in Paris, curated this exhibit. It included 147 architectural drawings of late 18th-century French architects who "rebelled against the traditional ideas of their contemporaries." Post-World War II Visionary architecture expanded after World War II. During this time, visionary architects tended to create designs that either anticipated the future or exaggerated and distorted existing structures. The Archigram Group The Archigram Group was a British art collective that explored avant-garde and visionary architecture from 1961 to 1974. It included Warren Chalk, Peter Cook, Dennis Crompton, David Greene, Ron Herron, and Michael Webb. Their work focused on the future of urban development without