"We tend to underestimate the political power of physical places. Then Tahrir Square comes along. Now it’s Zuccotti Park, until four weeks ago an utterly obscure city-block-size downtown plaza with a few trees and concrete benches, around the corner from ground zero and two blocks north of Wall Street on Broadway. A few hundred people with ponchos and sleeping bags have put it on the map. Kent State, Tiananmen Square, the Berlin Wall: we clearly use locales, edifices, architecture to house our memories and political energy. Politics troubles our consciences. But places haunt our imaginations."