In mechanics, three points collinear will form an instantaneous hinge, and maintaining this state will result in the loss of a large amount of internal force. The relationship between many people is like two unrelated points. Although they will meet at a certain node, the collision is only an instant. If you want to maintain the state of three points and one line, it will consume a huge amount of internal energy.
Purpose: To verify whether the three-point-one-line life really exists
