Progress – The oxygen machine Sizes: 150 × 150 / 300 × 199 / 600 × 398 / 1536 × 1020 / 640 × 640 / 640 × 640 / 640 × 640 / 50 × 50 / 50 × 50 / 50 × 50 / 1920 × 1275 Progress - The oxygen machine, 1994 Progress – The oxygen machine, 1994. Private collection, Milan