Artist Ryan Cashman created this neat film of a green LED alien playing the piano in San Diego. [vimeo http://vimeo.com/1185346]
If you're wondering how on earth this was produced, Cashman explains:
I wrote the music and recorded it first. The frames were photographed with a Canon Rebel using 20-30 second exposure time. I used a small green LED keychain light to draw each frame. Once all the positions were photographed they were strung together and synchronized to the music in After Effects.
[Via]