Claire Falkenstein, Floating Structure, Cut and brazed iron, 76.8 x 128.9 x 44.4 centimeters, 1958-1959, Smithsonian American Art Museum, Washington, D.C.
Manuel Saiz, Cordillera. Paisaje romántico (Mountain Range. Romantic Landscape), Iron and electric light, 100 x 130 x 80 centimeters, 1988, Museo Nacional Centro De Arte Reina Sofia, Madrid, Spain