The central circle shows a coloured pattern on the floor of a room with a cylindrical mirrored wall. As you (the dot) walk around in the room, the images of the floor you see in the surrounding plane depend on your location.pic.twitter.com/f6DemWnqX9
we're not done quite yet. there's a relationship between these and Maass forms, but first we have to explicitly extract the Bessel functions
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the key term is /billiards/
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