This puzzle took me a few weeks to complete, but was extremely satisfying when I did. You'll become very keen towards the different shades, pencil thicknesses and crisscross sizes used in this Escher drawing. The pieces are well made and lock better, in my opinion, than the Ravensburger puzzles. Note that the green border of the puzzle is there and the vertical borders are slightly narrower than the horizontal borders. I found this puzzle to be very challenging for a 1000 piece, so best of luck!