each "neurone" is connected to 3 of its colleagues, and try to place itself at a certain distance of them. Obviously, a lot of problems appears while trying to do so. That gives a kind of perpetual noise in the scene.
There's a lot of explanation on "how to use" and "what mean what" at the bottom of the sketch's page -> frankiezafe.net/fileadmin/labo/closeness/closeness.html
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