I really liked an image from the last of this year's series of Royal Institution Christmas Lectures. The best representation I could find after a quick search was this image:
.. from www.codeproject.com. If a magnetic pendulum centered over 3 magnets (colour-coded as in the right hand image) is moved to any point and released, the fractal image on the left shows over which magnet it will finally come to rest.
Hugo
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