Here is an interesting concept by French designer Aissa Logerot, Halo or LED Spray Paint, which is shaped like a spray can.
The spray can features and LED light which can change color, and it is powered by an internal battey, this is then combines with slow shutter photography, which captures the light graffiti in thin air, check out some more photos after the jump.
This is a great idea, and I bet this could produce some really interesting effects.
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