The fact that the lines on the green mat in the background aren't parallel will cause many an OCD relapse. It must have something to do with the angle of the diagonal cut. But beyond my comprehension.
Clever and I don't quite get it. I think the key is that the diagonal traverses exactly one chunk. The other key bit is that he doesn't push it completely back together so you don't see that the reassembled column is a quarter shorter than the others.
If you look at the width of the separated squares either side of the diagonal line, they are narrower than the unbroken squares in the rest of the block, plus the top left square is missing some chocolate too, plus the cut on the underside that we can't see may be crucial No, I haven't a clue either
If you look at the final row of four with the diagonal cut through them you will see that the area of each of these four blocks is actually smaller that the other uncut blocks. The fact that he doesn't quite fully push them together disguises this a little, but effectively each is a quarter area smaller than the uncut equivalents,
