1969–1970
Gemini G.E.L., 1970
Gemini G.E.L., 1976
Gemini G.E.L., 1992
Anni Albers, 1972
Gemini G.E.L., 1971
Gemini G.E.L., 1985
Benjamin B. Smith, 1978
Benjamin B. Smith, 1972
Gemini G.E.L., 1966
Gemini G.E.L., 1987
![#6 (after 'Untitled 1975') [progressive proof 15]](https://api.nga.gov/iiif/55152616-bdc8-4db4-94d1-fffd9fee52f0/full/843,/0/default.jpg)
![#6 (after 'Untitled 1975') [progressive proof 14]](https://api.nga.gov/iiif/377d266d-acaf-42f6-b27b-32c1a33434f2/full/843,/0/default.jpg)
![Bent "Blue" [trial proof]](https://api.nga.gov/iiif/0897b9bd-7a5c-4315-b3e0-da35c5fc8db7/full/843,/0/default.jpg)
