Computer graphics
Peter Harpley
A great number of impossible triangles form complex knotted image here.
Artist's RedBubble profile http://www.redbubble.com/people/peterharpley
Improbable by Entirely Possible
The image was found at http://www.redbubble.com/people/peterharpley/art/1266193-1-improbable-but-entirely-possible