M.C. Escher shape puzzle

Unlike regular jigsaw puzzles, which have pieces that don’t match up with the artwork, this puzzle’s 40 large pieces are cut in the shape of the black and white creatures from artist M.C. Escher’s 1957 lithograph Mosaic II. The puzzle is a lot harder to solve than you may think. It’s out of print, but used ones are available on eBay and Etsy. — MF