X-Seed 4000 
Thinking big. Unconstructable at present, but a design for an quasi-arcology building that houses over half a million people and is 4km high has been drawn up.
http://www.acceleratingfuture.com/michael/blog/?p=24

Thinking big. Unconstructable at present, but a design for an quasi-arcology building that houses over half a million people and is 4km high has been drawn up.
http://www.acceleratingfuture.com/michael/blog/?p=24