I really like the idea of a virtual world that runs in parallel to our own: millions of camera-containing devices out there, all hooked up to the internet, cont

I really like the idea of a virtual world that runs in parallel to our own: millions of camera-containing devices out there, all hooked up to the internet, continually building and refining a virtual facsimile of the real world. Then you could hold up your phone on a street and see, augmented reality style, the virtual people who inhabit it in parallel to you. Kind of a cool concept.