I’m alone in my apartment, trying to understand what a city is. The internet assures me only that there is no clear answer—even the United Nations has three definitions for what constitutes a city. I’m fixating on population size, but even that’s slippery. An “urban area” can apparently be distinguished from a “metropolitan area,” but somehow the largest “urban area” in the United States is called the “New York metropolitan area” (wait, what?) which has recently been more broadly identified as a “metropolitan statistical area,” throughout which one large urban center spreads its web but the whole of which is not legally incorporated as a city. I look at the satellite image of a bright core and then yellow sparks clustered along the Atlantic Ocean, spreading. My head aches; all I see is a never-ending chain.