Easy SideWalk Graffiti

The project "bikeagainstbush" developed a dot matrix bike printer that dispenses chalk instead of ink. The moving bike can easily spray text messages on sidewalks as it moves along. The creator of this nifty gadget has a video demonstration on his site. From the looks of it, he has a laptop on the bike which controls the chalk dispensers. And then he uses his cell phone to type in the desired text he wish to spray on the sidewalks or streets. This is pretty cool.

Check it out here