The same high mountains that surround the Norwegian village of Rjukan and lend the place its storybook charm also have the unfortunate tendency to block out the sun for nearly half the year. But last summer, long-benighted villagers took a bright idea for illuminating their town square year-round and set it in stone: they installed a solspeil, a system of giant mirrors that take up a combined 550 square feet, atop the big cliffs looming over their little hamlet.
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