Modern mobile phones with cameras and GPS can be used to layer information over reality. At it's simplest, "augmented reality" means you look at the world through the screen of your mobile, using the camera, and the phone uses its GPS and compass to work out where you're standing and what direction you're looking in. It then overlays information on top of the view. Videogames, Internet information and adverts (as well, of course, as military hardware) are all getting the AR treatment now. Want to know more? Read my piece from Stuff Magazine.
