Over that, they attach a half-inch layer of foam to give the structure some yield for little climbers.
WSJ: If Kids Can Play, Will Mom Shop?
Smaller bubbles make for a stable, uniform layer of foam.
FORBES: The Science of Small
In Afghanistan, the foam would be wrapped in a low-tech layer of chicken wire, then covered in a thin layer of concrete.
BBC: Aftermath of 1998 quake in northern Afghanistan
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