Superstar is a conceptual china town designed by MAD. A person could be born, live his life and die without living the star-city. The spires act like different districts. The Superstar produces its own resources and leaves no waste. On top of all that it is mobile.
How exactly does the city suppose to move is unclear and even if it could move around, moving something as big as this would certainly result in damages to the structure, unless of course, it is fitted with an anti-gravitational engine which would allow the star to take off and land smoothly. So I guess the next step for MAD is to design an anti-grav engine – good luck to them.