You might like Left Right Variation A Alan Green 1974 Variation B Alan Green 1974 Variation C Alan Green 1974 Four Rectangles Alan Green 1975 Second State Alan Green 1975 Second State Alan Green 1975 Black Alan Green 1976 1/4 Black Diagonal Alan Green 1976 1/2 Red Black Alan Green 1976 2. 90% on White Alan Green 1977 Black over White Alan Green 1975 One to Four Alan Green 1982