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Initially it seems difficult to understand the physics of what is going on.  The standard Bernoulli effect relies on the object being completely immersed in the upward-flowing fluid.  But in this case the water forms a single stream around the object and it's deflected away and down from the stream.  By Newton's third law, the force on the water by the ball is equal and opposite to the force of the water back on the ball, pushing it up into the stream.  There is a stable equilibrium position because if the ball moves into the stream, it "cuts off" the water going over the ball so it drifts out.  If it drifts out too far, then lots of water passes over the ball, pushing it back into the stream.   Music "Colored Spirals 3" "Magnified X 3" "In Orbit 2" "ExperiMental 1" by Epidemic Sound.

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