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 on Black Alan Green 1976 1/4 Black Diagonal Alan Green 1976 1/4 Black Red Alan Green 1976 1/2 Black Alan Green 1976 Black over White Alan Green 1975 White Diagonal to Edge Alan Green 1975 White over Black Alan Green 1975