Left to right: "Stations of the Spectrum (Blue, Green, Red)", 1967-1969, Collection Tate Gallery, London, UK; "The Old Lie", 1997-1998, Pace Gallery, New York, NY; "Of a Fearful Symmetry", 1991, Pace Gallery, New York, NY; "Grey Wraparound Triptych", 1970, Glenstone Museum, Maryland.