I have no idea where this came from. I guess it was just tucked away in the ol' gray matter and the Double Take challenge moved some cobwebs out of the way...
I've always loved Escher's work and I hope you'll enjoy my take on it.
Not much to the Post Processing.
In RAWTherapee, increased blacks.
Cropped, converted to B/W, a touch of unsharp mask, cloned dust spots, scaled to size and optimized for Web using Gimp.
Lighting:
Used Nikon SB-20 from about 3 ft. away, ~45^ camera right and above subject, set on wide angle at 1/8 power.
Statistics
Place: 54 out of 152 Avg (all users): 5.5767 Avg (commenters): 6.3333 Avg (participants): 5.6522 Avg (non-participants): 5.5333 Views since voting: 2010 Views during voting: 335 Votes: 189 Comments: 5 Favorites: 0