This is an attempt to use motion-sensing to track head movement.
Follow the instructions, and the 'tips for success'.
As long as you don't try too hard to fool it then it works quite well.
**UPDATES: more sensitive to head-tilt, much faster reaction
HOW IT WORKS: it uses a grid of small clones spread across the screen to sense movement. The dots and lines that appear as you move show the motion detected by each clone.
Since there are so many clones, you need a fairly fast machine for this to track your movements at a decent frame-rate.
It seems like the motion *direction* (shown by lines) isn't that reliable for such small costumes, so I ignore it. And using a bigger costume makes it lag much more, as it has to detect over all their pixels.