Picture yourself sitting at a restaurant on a sidewalk of Manhattan. You’re searching for a menu, but none are on the table. You flag down a waiter and with a dismissive smile he points to a square box with a pattern of black pixels. Sighing, you retrieve your smartphone, point the camera, and wait for a connecting signal.
But there’s no signal where you are seated. Nor if you raise your arm in the air. You end up wandering into the middle of the