http://demonstrations.wolfram.com/RelativeMotionInASubwayStation/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
If you are on a subway train in a subway station, you can see people standing or sometimes walking in the aisles of another train; your train or the other train might be moving in either direction. Sometimes it is hard to say what is moving! This means ...
Contributed by: Enrique Zeleny
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