Look at the video after he's taken the pieces out of the frame and reassembled them on the table—say, at 1m20s (http://youtu.be/_LY7mf49l5k?t=1m20s http://youtu

Look at the video after he's taken the pieces out of the frame and reassembled them on the table—say, at 1m20s (http://youtu.be/_LY7mf49l5k?t=1m20s http://youtu.be/_LY7mf49l5k?t=1m20s or screen shot here: http://imgur.com/GgxONLV http://imgur.com/GgxONLV). He's kept the two reassembled halves separate. Look at the diagonal edges of the halves. They don't match up! I've put them together in Photoshop to make it clear: http://imgur.com/gsP6AxG http://imgur.com/gsP6AxG When you put the two halves together, you don't get full cells. You get a crazy mishmash, because the height of one of the halves has been increased by 3/7ths of a cell-height. He replaced some pieces when he flipped the frame over.