OK, this is kind of cool, but kind of scary at the same time. Built by the Institute for Applied Autonomy, this spray-painting van is an ink-jet printer for the road. Pretty cool idea, but what would you actually do with it? Well, the IAA's stated mission, according to CNET, is "to study the forces and structures which affect self-determination and to provide technologies which extend the autonomy of human activists." That basically boils down to this being a graffiti truck, and that's effin sweet.

The so-called StreetWriter uses a "computer-controlled industrial spray painting unit" in an extended-length cargo van. The printings are probably best read from above, but even those on the ground will get the message. At right is a view of the inside of the van.

[Source: CNET via Engadget]