Heinz Mack Vibration, 1959 Hand embossed aluminum on masonite board 37 x 44.5 x 2.5 cm - 14 1/2 x 17 1/2 x 1 in 47 x 54 x 7 cm - 18 1/2 x 21 1/2 x 3 in (in acrylic glass case)
