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.



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.
That's what I said, the minute I read your postIf 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,
I have now destroyed three bars of chocolate trying to do this.