No. 646 Robert KLIPPEL No. 193 Robert KLIPPEL No. 356 Robert KLIPPEL No. 709 Robert KLIPPEL Untitled (Study for sculpture) Robert KLIPPEL (Untitled) Robert KLIPPEL Structures in a landscape Robert KLIPPEL Untitled (drawing) Robert KLIPPEL Study for sculpture Robert KLIPPEL No. 318 Robert KLIPPEL (Untitled) Robert KLIPPEL No. 651 Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) (Collage) Robert KLIPPEL (Untitled) (Multiple studies) Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) Robert KLIPPEL Drawing (Environmental construction type) Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) Robert KLIPPEL Untitled Robert KLIPPEL (Untitled) Robert KLIPPEL Untitled Robert KLIPPEL (Study for sculpture) Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) Robert KLIPPEL (Untitled) Robert KLIPPEL