Richard Serra 

Prop

, 1968

Plate: 60 x 60 x 1/8 inches (152.4 x 152.4 x 0.3 cm) 
Pole: 8 ft. (2.4 m) long, 4 3/4 inches (12 cm) diameter

Photo by Harry Shunk © Roy Lichtenstein Foundation 
© 2017 Richard Serra/Artists Rights Society (ARS), New York