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Glow Doodle

Glow Doodle

Glow Doodle is a quirky drawing app that lets you draw with light, and you can try out if you've got a webcam. If you've ever taken a photograph of something moving and seen the streak effect, you'll get how it works. Open up the app, and get some kind of light source, like a cellphone, and move it around in the air. It will leave a trail, and you'll have a light drawing. 

 
Experiment with different objects to see what kind of results you get. The reflection from a pair of glasses works pretty well and imagine a shiny watch face would be pretty cool, too.