Bowling ball pendulum swings back to nose.

Bowling Ball and Nose. Bowling ball on cable is brought up to the nose, and then let go. On the return swing, the ball will come up almost to the nose (Unless , of course, the person has leaned forward...) To prevent the person from leaning forward, an optional forehead support can be requested. Note: Cable is in each lecture room, already mounted to the ceiling.
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Demo Diagram: