Ball on the Border of a Rectangle
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A small ball walks around a rectangle. Change the colors and move the ball around the border!
Contributed by: Guilherme Kronemberger (March 2011)
Open content licensed under CC BY-NC-SA
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"Ball on the Border of a Rectangle"
http://demonstrations.wolfram.com/BallOnTheBorderOfARectangle/
Wolfram Demonstrations Project
Published: March 7 2011