Urban cycles of decline, decay, and abandonment followed by rebirth through rehabilitation, renovation, and reconstruction may appear to be natural processes. In fact however, the fall and rise of cities are consequences not only of financial and productive cycles and state fiscal crises but also of deliberate social policy.
— Martha Rosler (1991) in Sholette, G. (1997) UNNATURAL SPECULATIONS: Nature as an icon of urban resistance on NYC’s Lower East Side 1979-1984 (pdf)