> For each pixel, initialise a particle to that starting point, and let it 
> wander under the influence of the attractors in the system. (Three 
> "magnets" plus a "string" force to simulate a gravitational pull towards 
> the center.) Colour each pixel according to the current X, Y coordinates 
> of the particle. (X = red, Y = green.)

Those images are really cool!  So let me get this straight, you colour each 
pixel based on where the point that started at that pixel is at that 
instant?

Must be really cool to see it being animated.

You could calculate the speed of each point, and assign that to the blue 
channel :-)

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