If Leonardo Da Vinci were to be alive in our days, he would have painted his masterpiece pixelating it. Ok, you lose all the details, but squeezing your eyes you will still be able to see Mona Pixa’s Smile (first image).
I managed to index the color palette, allowing diffusion so to match original colors. The result is a new pattern that adds to the original checkers (second image). You can download a hi-res version, to be printed at the original size of the painting (GIF, 1.8MB). As you can see in this enlargement of the smile (third image) details are back! By the way, I’m not the first to discretize Mona Lisa.