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 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 State of Change David Leverett 1973 Shift Open David Leverett 1975–7 Laminations David Leverett 1975–7 Spring David Leverett 1971–2