Here is another classic kinetic sculpture from Gordon Bradt. The Tennis Player Kinetic Sculpture from Kinetico Studios has an adjustable design. It tries to hit the ball as soon as you turn it on. It is not noisy either.
More gadgets like this: here
Gordon Bradt made other versions of this sculpture, including a Golfer, Skier, and Jogger version. You can find them on eBay.
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