jigsaw puzzles

Arisia isn't an ordinary jigsaw puzzle, with a set number of pieces and a right answer. It has too many edge pieces and not enough middle pieces, and some of the pieces only fit together if you hit them with a hammer. The final picture is a photomosaic; it's beautiful to look at when fully assembled but you only get very vague cues from one piece about which one should go next to it. I expected to have to burn a few pieces along the way. But I've burned a couple I hadn't intended to, and not for any good reason.