Mysterious to the End: Andy Warhol’s late work » Andy Warhol, Oxidation Painting (in 12 parts), 1978. Acrylic and urine on linen, 48 x 49 inches. The Andy Warhol Museum, Pittsburgh; Founding Collection, Contribution The Andy Warhol Foundation for the Visual Arts, Inc. © 2010 The Andy Warhol Foundation for the Visual Arts/Artists Rights Society (ARS), New York

Andy Warhol, Oxidation Painting (in 12 parts), 1978. Acrylic and urine on linen, 48 x 49 inches. The Andy Warhol Museum, Pittsburgh; Founding Collection, Contribution The Andy Warhol Foundation for the Visual Arts, Inc. © 2010 The Andy Warhol Foundation for the Visual Arts/Artists Rights Society (ARS), New York

Andy Warhol, Oxidation Painting (in 12 parts), 1978. Acrylic and urine on linen, 48 x 49 inches. The Andy Warhol Museum, Pittsburgh; Founding Collection, Contribution The Andy Warhol Foundation for the Visual Arts, Inc. © 2010 The Andy Warhol Foundation for the Visual Arts/Artists Rights Society (ARS), New York