In his essay "Urbanism as a Way of Life," Louis Wirth defined a city as a type of community which is large, dense, and comprised of socially heterogeneous individuals. Based on your understanding of the lectures, readings, and videos to date, evaluate the continuing usefulness of Wirth's approach for understanding life in contemporary cities. Give three examples of how this concept helps us -- or fails to help us -- understand the role of community in contemporary societies.