1967
Gemini G.E.L., 1992
Kenneth Tyler, 1995
Frank Stella, 1992
Gemini G.E.L., 1986
Gemini G.E.L., 1981
Gemini G.E.L., 1968
Gemini G.E.L., 1973
Gemini G.E.L., 1976
Gemini G.E.L., 1999
Frank Stella, 1996
Gemini G.E.L., 1979
![Figure 3 [trial proof]](https://api.nga.gov/iiif/e68af6c9-d264-485e-8f17-bbfc36dff5fa/full/843,/0/default.jpg)
![Figure 9 [working proof]](https://api.nga.gov/iiif/90a65667-f341-420a-be95-0fa664116476/full/843,/0/default.jpg)
![Group [special proof]](https://api.nga.gov/iiif/9463a9e4-1168-4631-bc62-fb168d75570d/full/843,/0/default.jpg)