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Line 79: == External links == [http://www.kleinbottle.com/ Acme Klein Bottles] - Actual Klein bottles! (Or at least 3D projections of them, sold by [[Clifford Stoll]]). [http://www.cut-the-knot.org/do_you_know/paper_strip.shtml Paper Strip Activities] * [http://www.cut-the-knot.org/Curriculum/Combinatorics/Sliders.shtml Slider puzzles] (Slider puzzles on the plane, cylinder, torus, Klein's bottle and Projectie plane)

Klein bottle: Difference between revisions