180 particles move linearly at various constant speeds, in randomly chosen directions. For each pixel, determine the set of distances from the pixel to each particle. Sort this set: say the result is d0,d1,d2,... in order. Then let k=(d2-d1)-(d1-d0). Color the pixel based on an increasing function of k.

For this one, the distances are calculated using the L1 distance, i.e., the distance from (x1,y1) to (x2,y2) is abs(x1-x2)+abs(y1-y2).

Made with processing (processing.org).

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