Riverfront Crossings Park, Iowa City Louisiana Virlane Tower, 1981, Sydney and Walda Besthoff Sculpture Garden at NOMA, New Orleans Maryland B-Tree, 1981, National Institutes of Health, Bethesda Easy Landing, 1977, City of Baltimore, Baltimore Six Number Two, 1967, Annmarie Sculpture Garden (Smithsonian partner/annex site), Solomons, Maryland Massachusetts Mozart III, 2008, Science Center, Wellesley College, Wellesley, Michigan Indexer II, 2001, University of Michigan, Ann Arbor B-Tree II, 2005, Frederik Meijer Gardens & Sculpture Park, Grand Rapids Missouri Triple Crown, 1991, Hallmark, Inc., Kansas City, Missouri, just north of 27th Street between Main Street and Grand Blvd, at the South end of the Crown Center complex. The sculpture consists of 30–40 aluminum tubes held together and apart by steel cables. The entire assembly is roughly 23 meters on each of three sides and roughly that tall, with the low point being roughly 5 meters above the ground. Nebraska Able Charlie, 1983, Joslyn Art Museum, Omaha New York Coronation Day, 1980, City of Buffalo, Buffalo E.C. Column, 1969–81, Albright-Knox Art Gallery, Buffalo Four Chances, 1982, Albright Knox Museum, Buffalo Fair Leda, 1969, Nelson Rockefeller Estate Free Ride Home, 1974, Storm King Art Center, Mountainville Mozart II, 1982, Donald M. Kendall Sculpture Garden at Pepsico, Purchase Sun River, 1967, Whitney Museum of American Art, New York One World Trade Center antenna/spire, 2006, One World Trade Center, New York New Jersey Northwood II, 1970, Compton Quad, Graduate College, Princeton, Mercer North Carolina Northwood II(maquette), 1970, Asheville Art Museum, Asheville Pennsylvania Forest Devil, 1975–77, Museum of Art, Carnegie Institute, Pittsburgh Ohio Forest Devil, 1975, University of Cincinnati, Cincinnati V-X, 1968, Columbus Museum of Art, Columbus Oklahoma Sleeping Dragon, 2002–03, Kirkpatrick Oil Company Building, Oklahoma City Tennessee Dragon II, 2005, Knoxville Museum of Art, Knoxville V-X-II, 1973-4, Hunter Museum, Chattanooga Texas Northwood, 1969, Northwood Institute, Cedar Hills Vermont "Hard Wired", Bennington (College) Wisconsin Northwoods III, 1970, Milwaukee Art Museum, Milwaukee International Germany Soft Landing, 1975–77, Berlin Nationalgalerie, Berlin Avenue K, 1968, City of Hannover The Netherlands Easy-K, 1970, Sonsbeek ‘70, Arnhem Needle Tower II, 1969, Kröller Müller Museum, Otterlo Japan Osaka, 1970, Japan Iron & Steel Federation, Kobe T-Zone Flight, 1995, JT Building, Toranomon, Tokyo Landing, 1970, Wakayama Prefecture Museum, Wakayama Location Unknown Audrey I, 1966, Private Collection Audrey II, 1966, Private Collection Equilateral Quivering Tower, 1973–92 Tri-Core Column, 1974 Wing I, 1992; Ed. 4, Private collection : University of Puerto Rico – Mayaguez Rainbow Arch, 2001