Everything said so far about this is pretty accurate. A clever effect, and probably quite deserving
of the high ratings its getting. I think however, that at this price for a single trick, more effort
should go into producing a clearer explanation... And I personally feel that Penguin has dropped the
ball a little in this regard. It's very poorly explained. Of course, you will get it, but expect to
have to watch the video multiple times. What would be really useful would be a one page pdf clearly
outlining the setup, and the steps. May just do that now!