You might like Left Right Variation A 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 Black on Black Alan Green 1976 White on Brown Alan Green 1976 1/4 Black Diagonal Alan Green 1976 1/2 Black Alan Green 1976 1/2 Red Black Alan Green 1976 Black over White Alan Green 1975