One of the most crowded cities in the world – and also one of the shortest on available land area – Tokyo, Japan is a city bursting at the seams. Hoping to relieve the stress of alarming overpopulation, the city’s construction industry has trained its sights on the only vacant lot around – the waters of Tokyo Bay. Witness the impossible dream of city planners: to build a massive pyramid over the water, with skyscrapers suspended like peapods within its enormous frame. The proposed structure is so large that it cannot be built with currently available materials, due to their weight. The design relies on the future availability of super-strong lightweight materials based on carbon nanotubes. Segment 1 (10:00 min)

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