Now I'm not a massive fan of graffiti, but this app really shows the potential of a very cool concept. It is basically an underground artistic layer only seen by those who want to see it as it is held virtually within augmented reality.
Nice idea, but now I know they have just been reading my final project idea proposal blog post... Gotcha channel4!
As part of the Street Summer season of programming and events, we created Street Tag, an app that turns your iPhone into a can of spray painted using augmented reality. Using the iPhone's camera, It allows users to virtually graffiti any surface in real time, without the risk of being arrested. The app has the ability to recognise surfaces, and let your virtual paint sit flat on them. When you've finished, share your work with a geo-tag so everyone can see it.