Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsTwisted Polygonal Torushttp://demonstrations.wolfram.com/TwistedPolygonalTorus/]]>http://demonstrations.wolfram.com/TwistedPolygonalTorus/Möbius Strip as a Half-Twisted Square Torushttp://demonstrations.wolfram.com/MoebiusStripAsAHalfTwistedSquareTorus/]]>http://demonstrations.wolfram.com/MoebiusStripAsAHalfTwistedSquareTorus/