1972
Gemini G.E.L., 1986
Robert Rauschenberg, 1974
Robert Rauschenberg, 1990
Kenneth Tyler, 1971
Robert Rauschenberg, 1983
Ron McPherson, 1973
Robert Rauschenberg, 1963
Kenneth Tyler, 1972
Gemini G.E.L., 1974
Gemini G.E.L., 1973
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![Knee [proof]](https://api.nga.gov/iiif/73e52519-98c2-4b64-855b-2e88dd4b75b9/full/843,/0/default.jpg)