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They are called heliostats. They actually built a massive one into a building near my office in order compensate for the loss of natural light in the village square. https://youtu.be/6nYkQR-kPyM

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That was cool! I was expecting this though: https://youtu.be/ja6Zju2W_XY

Wow! That's inspiring, though (perhaps inevitably) some of those arrays hanging off of buildings look a little clunky. Thanks for sharing :)

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