We have not reached the second decade of the new millennium but Belgian architect Vincent Callebaut is already imagining the cities of tomorrow. The “Hydrogenase” was conceived as a flying city powered by bio-fuels, wind turbines, and solar panels. Callebaut is proposing a new way of travelling, one that is slower than airplanes but faster than automobiles and ships. It flies at 2000 meters high and could carry up to 200 tons at 175 km/h. The semi-rigid and not pressurized airship consists of a vertical spine that twists along its 400 meter-high structure. It is subdivided in four main sectors for housing, offices, laboratories, and entertainment areas. These four sectors rest under four “bubbles” filled with bio-hydrogen and helium.






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