http://www.grand-illusions.com/videos/dragon%20illusion.wmv
Sorry, it’s a WMV file, but it’s well worth watching if you haven’t seen this effect before. Turn the sound on to listen to the commentary too.
No matter how many times you watch the end “reveal shot”, the illusion still works. 
Yes, it is cool, but we’re way ahead of you. There’s already a cool thread on this entitled “The Coolest Thing on My Desk Right Now.” I’m sure somebody will be along shortly with a link.
Ah. There’s just too much going on chez Cecil for me to keep up with…
I want one.
Well, go to the link in this thread and print one out!