1966
Gemini G.E.L., 1973
Gemini G.E.L., 1981
Benjamin B. Smith, 1967
Gemini G.E.L., 1990
James Webb, 1973
Josef Albers, 1964
Gemini G.E.L., 1969
Josef Albers, 1975
Gemini G.E.L., 1980
Josef Albers, 1972
Benjamin B. Smith, 1970
![Four Panels from Untitled 1972 [A panel, trial proof 1]](https://api.nga.gov/iiif/299c4e6f-b5d0-40d3-b16b-d644cc9f0bc8/full/843,/0/default.jpg)
![Cicada [trial proof]](https://api.nga.gov/iiif/a55ff16f-5be5-4796-8883-c8cf9ca2b643/full/843,/0/default.jpg)
![Four Panels from Untitled 1972 [D panel, trial proof 8]](https://api.nga.gov/iiif/00f14293-11b8-4a67-8213-b321bbdec020/full/843,/0/default.jpg)
![Figure 6 [trial proof]](https://api.nga.gov/iiif/e1ed54ae-ef8b-4792-86e2-64e73a8b1d64/full/843,/0/default.jpg)
![Drypoint Kappa [special proof]](https://api.nga.gov/iiif/d3138dde-9935-4612-8309-92d74464eeba/full/843,/0/default.jpg)
