M.C. Escher's "Day and Night" 1500 pc. A relatively rare puzzle made by Selegiochi. I've been puzzling since childhood and this was the most difficult I've ever done –– thanks to the
1000 piece puzzle, "Bond of Union" by M.C. Escher, Selegio… | Flickr
Escher's Bond of Union - 1000pc Jigsaw Puzzle By Buffalo Games (discon) - SeriousPuzzles.com