I recently renamed this drawing and added 'Flipable' to the title. While I was cataloguing the image, I noticed the strange way my father signed his 'L', making it look the same when viewed upside down. I had a hunch that was a giveway that the work could be viewed upside down as well and I think I was right. I've included both versions in this page so you can see what I mean.

My father did a few drawings that could be seen multiple ways, the most extreme example is Fairy Tale Four Ways.

SL