Escher's /Relativity/, /Another World/, the Necker Cube: /https://goo.gl/BNKEUw/ and https://en.wikipedia.org/wiki/Impossible_cube … simultaneously?
@Persepholalia: the corners of the cube -- landmarks/cities/metropolises/tiny places, relatively fixed side-crossings, context-dependent
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higher dimensional geometric topology is not my bailiwick. (I have to keep my perfectionism in check). I'll ask Scott Carter?
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