Frame of Reference 30th scale Year 1979 Medium sculpture Materials poplar wood, mirror, iridescent acrylic Dimensions 36″h × 38″w × 10″d ← Double Vision (1979-80) Reflected Sky Horizon Window (1977) → Related works Reflected Sky Horizon Window 1977 Standing Act 1973 2-Side Slant 1980 Complex Square 1 1980