Proposal for Concrete Cadillac 1970 Wolf Vostell Proposal for Concrete Cadillac Photostat, cement, internal dye diffusion transfer process prints, thermometer, pencil, and board on plywood 30 3/16 x 40 1/8 x 1/2 in. (76.8 x 101.9 x 1.3 cm) Gift of Jan and Ingeborg van der Marck