X-Seed 4000

X-Seed 4000 or Ocean City is the name of a visionary skyscraper - draft of 1980, he was scheduled for living, work and leisure of a million people and is the highest ever proposed skyscraper vision.; the 800 -story and 4000 -meter-high building was designed for an artificial island in Tokyo Bay off the Japanese coast. This individual building cells should be hung in the open, because of the conical shape reminiscent of a volcanic cone construction, for the approximately 500 million tons of steel were estimated and should have approximately six kilometers in diameter. The development should be carried out with up to 200 persons which lifts inside the huge steel pipes. A ride to the top would have taken 30 minutes. A dense population, however, was provided in only up to 2000 m altitude, about the supply of oxygen and heat would have been too costly. The Tasai Corporation, a native of the proposal, the estimated construction period of 30 years. It is believed that the construction cost of the X-Seed 4000 would be approximately between 238 billion are to € 712 billion. This was the approximate half of Japan's GDP in 1980.

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The New York artist Tobias Bernstrup was inspired by X-Seed 4000 to an eponymous art project.