4th wall: 24 lines from the center, 12 lines from the midpoint of each of the sides, 12 lines from each corner

Sol LeWitt, 4th wall: 24 lines from the center, 12 lines from the midpoint of each of the sides, 12 lines from each corner, 1976. Wax crayon, graphite pencil, and paint on wall, dimensions variable . Whitney Museum of American Art, New York; purchase, with funds from the Gilman Foundation, Inc. 78.1.4. ©Sol LeWitt/Artists Rights Society (ARS), New York