Based on what I have seen on a Public Broadcasting Station series about math
and physics (sorry, never can remember the name) this shows how two
different motions can appear the same, as a similar demonstration I found at
http://www.physics.lsa.umich.edu/demolab/demo.asp?id=44  would show were it
animated as well.
I gave this message post their title since I didn't know what to call the
effect myself. A bunch of things at that site that could be interesting to
remake in POV.

This is merely in the form of a model, not elaborate device or great
rendering, so you've been forewarned.  :-)  Just having a little fun with
the convergence of math and POV.
-- 
Bob H.
http://www.3digitaleyes.com

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