… and keep the best ones

When I worked for Zoesis, I once did a test animation of one block chasing another block around a… third block.  (Drawing's hard, okay?) I animated by writing computer code to control each character. About 15 times a second, at least one behavior for each character would execute that updated its speed and heading according to where it wanted to go and what was in its way.  (It used a behavior-based robot architecture, if you know what that is.)

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