...scientists find the way to massproduce Carbon Nanotubes at reasonable price and those megastructures can be built.
http://www.darkroastedblend.com/2008/08/gigantic-city-structures-of-paolo.html
I've always thought
I've always thought the Embarcadero are of San Francisco has already started us along this path...with the raised sidewalk platforms trussed between buildings, filled with sculpture and shops...while the little people scurry around in the darkness of street level...
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