When the actors move, they interact with other actors. Like actors performing on a stage, people conversing in a car, blood cells coursing through veins, interactions occur. Two people see each other in bar, walk over to each other, talk, and then perhaps dance together. Two cars avoid a collision by veering away from each other. Two blood cells bump into each other as they travel through a small capillary. The actors are engaging in a game. (
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