Works faster in Firefox than in chrome or IE. It will digitize whatever is on your screen and then animate it. If you have a webcam then it will scan from there, otherwise you can swap out the background picture (called "yourPicHere") with one of your own and it will scan that. You will see black squares once it starts scanning. You will see a crazy surprise once the scanning is complete.
See here for an explanation of how it works: http://scratch.mit.edu/projects/17713042/
