1966
Gemini G.E.L., 1972
James Webb, 1967
Josef Albers, 1942
James Webb, 1969
James Webb, 1968
Josef Albers, 1951
Gemini G.E.L., 1978
Gemini G.E.L., 1975
Josef Albers, 1972
Kenneth Tyler, 1963
![Figure 6 [color trial proof]](https://api.nga.gov/iiif/57ec32d2-ee51-4dd0-b369-ee69e962bee7/full/843,/0/default.jpg)
![Ale Cans [trial proof D]](https://api.nga.gov/iiif/f0e5dd50-8a7d-4005-8fd4-59412a8ef237/full/843,/0/default.jpg)
