Visual paradoxes are classified as non-trivial torsors: the global impossibility is exactly a non-zero H^1 obstruction class, with new examples on non-orientable surfaces and boundary-constrained figures.
The sheaf-theoretic structure of non-locality and contex- tuality.New Journal of Physics, 13:113036, 2011
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Obstructions to Reality: Torsors & Visual Paradox
Visual paradoxes are classified as non-trivial torsors: the global impossibility is exactly a non-zero H^1 obstruction class, with new examples on non-orientable surfaces and boundary-constrained figures.