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As the city developed, the democratic habits of the village would be often carried into its heretofore specialized activities, with a constant rotation of human functions and civic duties, and with a full participation by each citizen in every aspect of the common life. This sparse material culture, in many places little better than a subsistence regimen, gave rise to a new kind of economy of abundance, for it opened up virgin territories of mind and spirit that had hardly been explored, let alone cultivated. The result was not merely a torrential outpouring of ideas and images in drama, poetry, sculpture, painting, logic, mathematics, and philosophy; but a collective life more highly energized, more heightened in its capacity for esthetic expression and rational evaluation, than had ever been achieved before. Within a couple of centuries the Greeks discovered more about the nature and potentialities of man than the Egyptians or the Sumerians seem to have discovered in as many millenia. All these achievements were concentrated in the Greek polis, and in particular, in the greatest of these cities, Athens.
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Lewis Mumford (The City in History: Its Origins, Its Transformations, and Its Prospects)