What Are Those Grids of Glass in the Sidewalk, and Why Are They Purple?

I've always loved seeing glass bricks installed in architecture. My brother once installed a glass brick in his floor -with a light underneath- for no reason at all. You may have noticed grids of glass installed in the sidewalks of a city, which we assume are there to let light in. But where does that light go, and why is it needed? What are the origins of those grids? And most importantly, why are some of them purple? You'll find answers to all those questions at KQED. The question they don't answer is: Where can I get some of that purple glass for my floor? -via Digg

(Image credit: Flickr user Mike)


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They have underground sidewalks like this in Seattle too. The tour offered through the Seattle Underground is very interesting. It feels like a lot like Neil Gaiman's Neverwhere book.
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