1000 piece puzzle, "Bond of Union" by M.C. Escher, Selegio… | Flickr
Collection MC Escher puzzles 12 pieces 1980 - Catawiki
M C Escher Puzzles | Fine Art America
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