The 26Sided Unilluminable Room

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http://demonstrations.wolfram.com/The... • The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. • If a candle is inside a room with mirrored walls, can any portion of the room be dark? In 1958, a young Roger Penrose found an unilluminable room with elliptical sides. In 1995, George Tokarsky proved that a light ray starting from one corner of a mirro... • Contributed by: Michael Trott

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