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Originally Posted by Gizmo  Yeah, I've got my reservations about that one as well. For one thing, structural integrity would seem to be a real issue, given that the whole thing moves, meaning that weight distribution could be continually changing on a rather large scale. |
An apartment need not weigh as much as a traditionally built one. I'm referring to the concrete walls and floor slabs.
This system for concrete slabs uses plastic balls to make the slab much lighter:
BubbleDeck - the Biaxial Hollow Deck
It also allows for buildings to have lightweight façades, with no concrete, which makes the building less likely to collapse.