I had the opportunity to have in front my eyes and admire it in Paris in "BeauBourg"museum some 10 years ago, at that time i joked with my wife that is was a "capture of the shadow cast by a silhouette of a shadow!"

Or something along those lines...

Some years later during a visit to Mount St. Michel, the memory came back...

Today while looking in to what witnesses to up-vote i landed here because i'm using the API to patch up a little script to monitor for quality discussions and your name is in all examples and found the walking man post and needed to tell you this...

Hahaha!

BTW I supposed you made that API so another thing to thank you for!