It used to be only Superman who could see through concrete walls, but an exhibit at the National Building Museum shows that mere mortals can do it, too.
Called Liquid Stone, the show features variations of translucent concrete, a newfangled version of the old construction standby that offers a combination of aesthetics and practicality.
A prototype wall of translucent concrete is shown at the National Building Museum. When backlit, a human form can be seen through the wall. The blocks are made by mixing glass fibers into the combination of crushed stone, cement and water — via boingboing
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