You might like Left Right Colour Structure 1 (trial proof) David Leverett 1971 Colour Structure 2 (trial proof) David Leverett 1971 Equinox (trial proof) David Leverett 1972 Summer (trial proof) David Leverett 1972 Autumn (trial proof) David Leverett 1972 Winter (trial proof) David Leverett 1972 Winter (trial proof) David Leverett 1972 Equinox (trial proof) David Leverett 1972 Spring David Leverett 1971–2 Summer David Leverett 1971–2 Autumn David Leverett 1971–2 Winter David Leverett 1971–2