‘Tractor,’ 1988, acrylic on canvas, 91 x 91 cm.Related work:‘To Mow the Lawn,’ 1988, acrylic on canvas, 38 x 55 cm.‘U,’ 1987, acrylic on canvas, 115 x 115 cm.‘Two Rubix Cubes,’ 1987, acrylic on wood, 56 x 99 cm.