A futuristic tower, called the X-Seed 4000 has been designed as an ecological structure of about 4000 meters high in Tokyo, Japan! Solar Energy would power the X-Seed 4000 which could house between 500 000 to 1 million people. The projected cost of a building like this have been estimated between 300 to 900 billion dollars.
OK, so even if this is a nice project, chances are that we will
not see this kind of tower being built in this century...
The X-Seed 4000 in the Tokyo landscape
The structure of the XSeed 4000
Inside the Tower
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