Calder, Jean Tinguely, Richard Lippold, George Rickey, Louise Bourgeois, Philip Pavia and Louise Nevelson came to characterize the look of modern sculpture. By the 1960s Abstract expressionism, Geometric abstraction and Minimalism, which reduces sculpture to its most essential and fundamental features, predominated. Some works of the period are: the Cubi works of David Smith, and the welded steel works of Sir Anthony Caro, as well as welded sculpture by a large variety of sculptors, the large-scale work of John Chamberlain, and environmental installation scale works by Mark di Suvero. Other Minimalists include Tony Smith, Donald Judd, Robert Morris, Anne Truitt, Giacomo Benevelli, Arnaldo Pomodoro, Richard Serra, Dan Flavin, Carl Andre, and John Safer who added motion and monumentality to the theme of purity of line. During the 1960s and 1970s figurative sculpture by modernist artists in stylized forms was made by artists such as Leonard Baskin, Ernest Trova, George Segal, Marisol Escobar, Paul Thek, Robert Graham in a classic articulated style, and Fernando Botero bringing his painting's 'oversized figures' into monumental sculptures. Gallery of modernist sculpture Contemporary movements Site specific and environmental art works are represented by artists: Andy Goldsworthy, Walter De Maria, Richard Long, Richard Serra, Robert Irwin, George Rickey and Christo and Jeanne-Claude led contemporary abstract sculpture in new directions. Artists created environmental sculpture on expansive sites in the 'land art in the American West' group of projects. These land art or 'earth art' environmental scale sculpture works exemplified by artists such as Robert Smithson, Michael Heizer, James Turrell (Roden Crater). Eva Hesse, Sol LeWitt, Jackie Winsor, Keith Sonnier, Bruce Nauman and Dennis Oppenheim among others were pioneers of Postminimalist sculpture. Also during the 1960s and 1970s artists as diverse as Eduardo Paolozzi, Chryssa, Claes Oldenburg, George Segal, Edward Kienholz, Nam June Paik, Wolf Vostell, Duane Hanson, and John DeAndrea explored abstraction, imagery and figuration through video art, environment, light sculpture, and installation art in new ways. Conceptual art is art in which the concept(s) or idea(s) involved in the work take precedence over traditional aesthetic and material concerns. Works include One and Three Chairs, 1965, is by Joseph Kosuth, and An Oak Tree by Michael Craig-Martin, and those of Joseph Beuys, James Turrell and Jacek Tylicki. Minimalism Postminimalism Contemporary genres Some modern sculpture forms are now practiced outdoors, as environmental art and environmental sculpture, often in full view of spectators. Light sculpture, street art sculpture and site-specific