The section of the fabled street just below 42nd Street, where Grand Central blocks the road forcing traffic to go around via the Park Avenue viaduct, is among Manhattan’s busiest pedestrian thoroughfares. The perfect place for some art. That’s exactly what Patrons of Park Avenue (POPA) had in mind when they started featuring art installations on the Park Avenue Malls. Yes, even Park Avenue has its underground, quite literally, and this one has a distinct downtown edge to it. Read Scott Orr’s account of what happens under Park Avenue.