Another variation of overlapping action.  This one almost combines the previous two assignments.  This is another pendulum type swing, only this time the pendulum arm is a string and therefore can bend.  This subtle change will effect the path of motion for the ball.  At the two extremes of the swing, the ball is no longer pulling on the string to keep it taught, the ball is basically hanging in air for a beat.  During this time the string gets a little slack, which itself is effected by gravity.  So that slack starts to curve downward until the ball is once again moving downward and pulls on the string again making it taught again.  Its amazing what you can convey with a circle, a line, and a little time isn't it?