Sand Castle Holds Up A Car! - Mechanically Stabilized Earth

I wouldn't want to build my house on a sand castle foundation, admittedly. In fact, I posted something about the dangers of that before

Reinforced sand, on the other hand, looks like it might be something a little different. Just adding in some fabric - or screening - between layers of packed sand makes for a far stronger product. It's almost like it's a composite.

(It is a composite, by the way, gaining new-found strength from the combination of strengths of the materials comprising the composite.)