LED Throwies 
LED Throwies are an inexpensive way to add color to any ferromagnetic surface! By Q-Branch
Figure A: That’s a lot of Throwies!
Developed by the Graffiti Research Lab (graffitiresearchlab.com) a division of the Eyebeam R&D OpenLab (research.eyebeam.org), LED Throwies are an inexpensive way to add color to any ferromagnetic surface in your neighborhood. A Throwie consists of a lithium battery, a 10mm diffused LED and a rare-earth magnet taped together. Throw it up high and in quantity to impress your friends and city officials.
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