New York City is a large place; almost 469 square miles of pretty dense civilization. Within the city, there are thousands of miles of sidewalks. As you walk through different neighborhoods, you may experience a variety of different atmospheres. In Cobble Hill, Brooklyn, it's quaint and quiet. In SoHo these days, there are so many pedestrians that they spill off the narrow sidewalks. While a neighborhood's atmosphere is, of course, a function of time, it is possible to get an average consensus of how 'crowded' each neighborhood feels by averaging over time. When we say 'crowded', we mean not just with people; we also mean with static objects, or street furniture, or, to get even more colloquial, 'clutter'. When we mix 'crowdedness' within the narrow environment of NYC's sidewalks, we endeavor to call this feeling 'claustrophobia', a direct mapping to the definition in psychology.