You’re walking down the street, looking for a good place to eat. You hold up your cellphone and use it like the viewfinder on a camera, so the screen shows what’s in front of you. However, it also shows things you couldn’t see before: Brightly colored markers indicating nearby restaurants and bars. Turn a corner, and the markers reflect the new scene. Click a marker for a restaurant, and you can see customer reviews and price information. Decide you’d rather be sightseeing? The indicators are easily changed to give information about the buildings you’re passing.
