Robert Mangold American, b. 1937

  • Robert Mangold, Attic Series X, 1991
    Attic Series X, 1991
  • Robert Mangold, Four Triangles Within a Square, 1974
    Four Triangles Within a Square, 1974
  • Robert Mangold, Triangle within a square (red), 1974
    Triangle within a square (red), 1974