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It's glass...
I read in one of those "house of the future" magazines about a product very similar to this. The see-through effect is achieved by imbedding thousands of glass fibers in the concrete, allowing small amounts of light to pass. The article I read had a "Disco Driveway" with blocks of concrete with different color lights beneath, it was (as quoted from a 5 yr. old) "neato schmeato!"
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"The problem with the world is stupidity. Not saying there should be capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?"
~Frank Zappa
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