-shuffles it, and then solves the puzzle. This works especially well
-when you feed it an external video signal instead of letting it grab
-the screen image (actually, I guess this is generally true...) When
-it is grabbing a video image, it is sometimes pretty hard to guess
-what the image is going to look like once the puzzle is solved.
+shuffles it, and then solves the puzzle.
+
+http://en.wikipedia.org/wiki/Jigsaw_puzzle
+http://en.wikipedia.org/wiki/Tessellation