Classic 'Missing Square' Dissection. Where does the hole come from?[br][br]Click any of the four quadrilateral shapes to spin them.[br][br]The pieces are simply rotated. They are not squashed or stretched and do not change area.[br][br]Attributed to Mitsunobu Matsuyama (https://en.wikipedia.org/wiki/Missing_square_puzzle)[br]

Explore the infinite chocoloate paradox (as seen in this video: http://youtu.be/nEct0Z9xE6A or https://www.facebook.com/video.php?v=554083064700378)[br][br]All pieces should be draggable.[br][br]There are two "versions" of the chocolate bar for a reason... :)

Try rearranging the pieces in the left version to make it look like the right version.[br][br]Do the same with the right version to go back to the left version.[br][br]Can you explain how the video is made?