Augmented reality traditionally uses increasingly commonplace technologies to add information to images on the screens of mobile phones and tablets. A digital camera and internet connectivity is combined with location data – so if you point your phone at Big Ben, because the device knows where you are it’s comparatively simple to add information to the image on screen. And while the obvious uses are for, say, historical information, there’s space for advertisers and social services to tell you where to, say, meet up with friends for a drink.