Hi, When a pendulum is swung and it reaches a point of reverse direction, there is a moment in time and space that the pendulum and the observer is effected by. A point where a given movement either starts, reverses or is changed. This point in time and space I call a "Teeter point" . Is there a conventional word currently in use to describe this action or should I say, moment of inaction? Is there any theories or ideas about this "teeter point"?