Reverse Reference Grounded (model) Year 1980 Medium sculpture Materials acrylic, wood, mirror Dimensions 8.75″h × 15.75″w × 13.75″d ← Imago Ignota (1980) Ten Degree Slant - F.O.R. 40th scale (1980) → Related works 2-Side Slant 1980 Complex Square 1 1980 Dyad 1980 Ever Present Square - Six - Red 1980