So today I finally got around to modifying my program to the point where 
you can *change* the arrangement of magnets without having to recompile 
the program. (The colouring scheme, however, is still hard-coded. In 
particular, if you move the magnets around, the colouring does *not* 
adjust to match.)

The attached image shows what happens if you change the green magnet 
from 1/r to 1/r^2 attraction, while leaving everything else the same. As 
you can see, pretty mental stuff ensues...

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