Your welcome! You seem to have a lot of good sifts going . I saw an illustrated description in one of Hirst's books I have before seeing this video. The stick figure guy was a little more humors than him explaining it.

In reply to this comment by griefer_queafer:
Thanks for the generous upvotes, matey! And I was happy to see the Hirst video, very interesting stuff, though I find his work kind of alienating sometimes. Keep on siftin' those goodies!