Halo is a beautiful device for spraying light. Shaped like a spray-can, the glass tube has an LED in the cap which shines when pressed. The form factor lets graffiti artists use their existing muscle memory to tag and draw.
Couple this with a camera set at a low shutter speed and you get some great effects, and the caps can be swapped to switch colors. The best part, though, is way you charge it. Inside, designer Aïssa Logerot has put a copper coil and some magnets on a spring. When the lamps finally dim and wink out, you shake the “can”, just like you would if you were mixing paint, and the battery is charged. Ingenious, and sadly not for sale.
Product page [Aïssa Logerot via Geekologie]