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In the spirit of taking things too far, here is a fully functional 5-dimensional analogue of Rubik's cube.
posted by Trurl on Sep 12, 2011 - 50 comments

92 years young, the delightful Raymond Smullyan is a mathematician, logician, magician, concert pianist, and Taoist philosopher - who also pioneered retrograde chess problems.
posted by Trurl on Jun 26, 2011 - 22 comments