Unfathomable City: A New Orleans Atlas, by Rebecca Solnit and Rebecca Snedeker, came out last month from University of California Press. At first glance it looks like it does for New Orleans what Solnit’s previous work, Infinite City, did for San Francisco: it’s a collection of essays and maps that, as before, displays two complementary or contrasting things on the same city map. In my review of Infinite City I suggested that not every city could sustain a project like this, though San Francisco obviously could; it seems to me that New Orleans is a natural followup.