I saw this done about a year and a half ago, and always meant to try it, but never got around to it until tonight. This is amazing! I don’t even want to tell you exactly what happens, or show you a video of it, it’s just one of those things that will make your jaw drop, in my opinion, the first time you see it.
The instructions are all on that web page, but it DOES require a webcam for this to work. You have to print out this piece of paper, and then you click a link, and once you see yourself in the webcam, just hold that paper up in front of the webcam. Please let me know of you try this, I’d love to hear your reaction!