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Dec 29, 2010 at 14:19 comment added Sam Nead Poincare, on page 66 of Science and Hypothesis (see books.google.com/books?id=2QXqHaVbkgoC&q=refraction) suggests using the ball model. This might be harder to build (as you have to layer material in concentric spheres instead of parallel planes) but could have other advantages.
Dec 28, 2010 at 6:46 history answered Ian Agol CC BY-SA 2.5