1971–1972
Gemini G.E.L., 1967
Gemini G.E.L., 1969
Ron McPherson, 1970
Gemini G.E.L., 1979
Serge Lozingot, 1973
Gemini G.E.L., 2004
Woodward Foundation, 1963
Gemini G.E.L., 1986
Serge Lozingot, 1975
![Figure 9 [color trial proof]](https://api.nga.gov/iiif/a6d86825-54ba-4a1a-921a-a56ed4b8b8f0/full/843,/0/default.jpg)
![Figure 4 [working proof]](https://api.nga.gov/iiif/1b40501b-1a1a-4c49-9a62-8d0bc7f31ac3/full/843,/0/default.jpg)
