Successful cities need both the human interactions of Jane Jacobs and the enabling infrastructure of Robert Moses. Anthony Flint has done a fine job describing the battles between these two great figures, but unlike the Louis-Schmeling fight, their conflict should not be resolved. An absolute victory for Moses leads to heartless cities, built to accommodate cars but not pedestrians, with high-rise buildings that are disconnected from their streets. An absolute victory for Jacobs means a city frozen in concrete with prices that are too high and buildings that are too low. New building is needed to welcome the diversity that makes urban magic. No city can survive without the personal engagements beloved by Jacobs, but no city can thrive without master builders such as Moses. Mumbai and Shanghai had better take note.