Nice article. The expansion of Euclidean geometry into hyperbolic and elliptical space did change all this fundamentally, most popularly seen in MC Escher's wo

Nice article. The expansion of Euclidean geometry into hyperbolic and elliptical space did change all this fundamentally, most popularly seen in MC Escher's work. Here for example is a hyperbolic dodecahedron (in which each pentagon has five right angles). http://www.bulatov.org/math/1101/webtalk.html#(38) http://www.bulatov.org/math/1101/webtalk.html#(38) That site also has a lot of other nice examples and analysis of MC Escher drawings.