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WikiPedia: Chai_Klein http://books.google.com/books?id=YZ1L8S4osKsC http://books.google.com/books?id=YZ1L8S4osKsC&pg=P... http://www.kleinbottle.com/meter_tall_klein_bottle... http://mathworld.wolfram.com/KleinBottle.html http://www.youtube.com/watch?v=E8rifKlq5hc http://www.youtube.com/watch?v=sRTKSzAOBr4&fmt=22 http://www-ifm.math.uni-hannover.de/~fugru/video/t... http://www.geometrygames.org/TorusGames/index.html... http://plus.maths.org/issue26/features/mathart/ind... http://www.zentralblatt-math.org/zmath/en/search/s...