Nick Leindecker of the Stanford Optical Society shows Laser Craze, a laser cutter that is controlled by two knobs much in the way an etch a sketch works. At Maker Faire Bay Area 2011 he allowed attendees to try out his invention on various burnable surfaces, while also showing his LED creations.
http://photons.stanford.edu/
http://makerfaire.com/pub/e/5042
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