Known to the ancient Greeks, it was reinvented by Sir David Brewster in 1816 while conducting experiments on light polarization; Brewster patented it in 1817. Brewster believed he would make money from his popular invention; however, a fault in the wording of his patent allowed others to copy his invention. It's name is derived from Greek for "beautiful shape to look at." What am I talking about?
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Kaleidoscope
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