The proposition: You and a bunch of strangers are live streaming mobile-phone video of some event or disaster. A server stitches it all together and instantaneously publishes a rich, immediate patchwork of the action.
An omnidirectional projector with a camera inside watches your hand movements and reacts fast, like a planetarium-wide Surface table. Does it give you a Zaphod-sized ego? Hell yes it does. Check out this vid: