The Path of a Ray on a Cube
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To find the path, unfold the cube, draw a straight line across the squares (repeated as necessary), and refold. This is harder for the other Platonic solids.
Contributed by: George Beck (September 2007)
Open content licensed under CC BY-NC-SA
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"The Path of a Ray on a Cube"
http://demonstrations.wolfram.com/ThePathOfARayOnACube/
Wolfram Demonstrations Project
Published: September 28 2007