
It took several decades for Bucky to realize that individual dome-homes were not going to be affordable for many who needed shelter. Worse, single-family homes are one of the main forces driving urban sprawl and high land prices. Bucky proposed megastructures.
One scheme called for two-mile-diameter spheres of 5000 inhabitants, moored or floating freely in the air. (At about one-half mile in diameter, geodesic spheres are lighter than the air they contain, and so will float like helium balloons.)
Some cities were to be under water, immune to storms, and served by equally immune submarines. Other cities were drawn afloat on the surface, too large and strong to be damaged by storms. Anchored offshore, free of inflated land prices, they offered energy-efficient, inexpensive housing near coastal city centers.