First, the pyramid's foundation would be formed by 36 piers made of special concrete.
Because the seismically active Pacific Ring of Fire cuts right through Japan, the external structure of the pyramid would be an open network of megatrusses, supporting struts made from carbon nanotubes to allow the pyramid to stand against and let through high winds, and survive earthquakes and tsunamis.
The trusses would be coated with photovoltaic film to convert sunlight into electricity and help power the city. The city will also be powered by pond scum or algae.
Robotic systems are planned to play a major part in both construction and building maintenance.
I couldn't resist a reference to the Sense/Net Pyramid from William Gibson's 1984 classic Neuromancer:
At 12:05:00, the mirror-sheathed nexus of the Sense/Net consortium held just over three thousand employees. At five minutes after midnight, as the Modern's message ended in a flare of white screen, the Sense/Net Pyramid screamed.
Half a dozen NYPD Tactical hovercraft, responding to the possibility of Blue Nine in the building's ventilation system, were converging on the Sense/Net Pyramid. They were running full riot lights...
Scroll down for more stories in the same category. (Story submitted 12/28/2015)