Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsChart for a Torushttp://demonstrations.wolfram.com/ChartForATorus/]]>http://demonstrations.wolfram.com/ChartForATorus/Robot Motion with Obstacleshttp://demonstrations.wolfram.com/RobotMotionWithObstacles/]]>http://demonstrations.wolfram.com/RobotMotionWithObstacles/