Digital screens now line the walls of nearly every airport terminal, restaurant, convenience store, bar and waiting room in America. They have popped up in gas stations, taxis, schools and even on public buses. They wrap the exterior of L.A. Live and other major commercial complexes. And increasingly they rest in our palms, in the form of the iPhones, BlackBerrys and other smart phones that many of us rely on, like Dante following Virgil, as we walk or ride through the city.
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