In her book "Death and Life of Great American Cities," written in 1961,
Ms. Jacobs’s enormous achievement was to transcend her own withering
critique of 20th-century urban planning and propose radically new
principles for rebuilding cities. At a time when both common and
inspired wisdom called for bulldozing slums and opening up city space,
Ms. Jacobs’s prescription was ever more diversity, density and dynamism
– in effect, to crowd people and activities together in a jumping,
joyous urban jumble.