Penrose Unilluminable Room Is Impossible To Light

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Penrose Unilluminable Room is a room with mirrored walls that can't be fully illuminated by a single point source of light. I thought I was the first person to build one but Action Lab beat me to it: https://youtu.be/inMihNPjevM

Here's Nils Berglund's channel: https://www.youtube.com/c/NilsBerglund

Alex Bellos's elliptical billiard table can be found here: https://youtu.be/4KHCuXN2F3I

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