Biomorphic Biosphere Megastructure, 1965
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Biomorphic Biosphere Megastructure: 1965-1977 Developed over a span of ten years, Glen Small's biggest, most ambitious, and most recognized vision evolved from his Vertical City design. Small describes the BBM as "a perfect city designed to solve the ecological problems of the world in a beautiful, gorgeous manner,", an "alternative to the existing mediocrity".

Specifically, it's more than a city, it's an environmentally friendly utopia. The living, breathing structure is close to an actual organism. It minimizes the taxation on natural resources, reuses, recycles, collects rainwater, grows food, traps pollutants, and uses direct natural energy. The estimated population of 11 million would reside in individual modules, that like in the Vertical City, would be mobile and flexible so that residents could easily move from through the stratification of the climate, from the alpine to the tropical. Ambitiously, Small planned to gradually phase out present structures of urban life in Los Angeles' crowded basin with the 8,000 foot structure. In eliminating modern demons such as excessive waste, money, and bartering, however, Small planned to leave historic preservation areas so as not to completely wipe out the existing city life.