A montage (2 images overlaid on one another). The first image is shown here - http://www.pbase.com/ed_k/image/73451637 and the second is here - http://www.pbase.com/ed_k/image/73451639 (I like the 2nd a lot as it is and would use it as a stand alone abstract anytime).
The two layers (links above) each have a description below them that describes how they were made. If you go to these links, clicking the "next" icon will take you through the entire sequence including this PAD.
Experimenting is sure fun. Beats just holding the viewfinder up to your eye and pushing the shutter release.