This is the illumination problem: There is a room with one candle in it. The light from the candle (which radiates out in all directions) will bounce off the walls and travel around the room indefinitely. Is it possible to have a room with areas that will never be illuminated by the candle? Short answer: Yes, such rooms exist. The shapes of two examples, though, are weirder than you'd think.
That's One Powerful Candle
Here's Where It Gets Weird
The Illumination Problem
Written by Curiosity Staff March 14, 2017
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