Ink and pencil
William Dudziak
Artist's web site http://www.dudziak.com.
Impossible ring with intersecting objects
The image was found at http://www.dudziak.com/picture.php/impossible_ring_with_intersecting8551.
Impossible World
Artist's web site http://www.dudziak.com.
Impossible ring with intersecting objects
The image was found at http://www.dudziak.com/picture.php/impossible_ring_with_intersecting8551.