Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsParametric Movement of a Rubber Bandhttp://demonstrations.wolfram.com/ParametricMovementOfARubberBand/]]>http://demonstrations.wolfram.com/ParametricMovementOfARubberBand/