“Most city diversity is the creation of incredible numbers of different people and different private organizations, with vastly differing ideas and purposes, planning and contriving outside the framework of public action. The main responsibility of city planning and design should be to develop – insofar as public policy and action can do so – cities that are congenial places for this great range of unofficial plans, ideas, and opportunities to flourish….”
Jane Jacobs, The Death and Life of Great American Cities (1961)