This volume brings together the essays of Paolo Soleri in which he sets forth his philosophy of arcology (architecture ecology) and pleads for a new stage in the evolution of human society—a move toward compactness, or miniaturization, of our cities. To do so we must build solids rather than veneers; we must flee from a “flat” cityscape that debilitates and suppresses the individual. Arcologies, three dimensional macrostructures, are for populations of thousands or of millions.