Lots of real-world glass products exploit total internal reflection to make them work. The most prominent are the prisms in binoculars and fiber optic cables which rely on TIR to deliver the signal through curved glass tubes.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)