According to nature law stone is static. How can it move?

Hanging from the branch of a tree is moves with the wind. Placed on the spring of a shock absorber it moves as well. The frequency of the movement depends on the size and the resistance of the spring and the weight and model of the stone.

I intend to use as much old/recycled materials as possible. The local blacksmith welds the steel springs, which I find at the car dump, on the iron harrow discs, which Salorino agricultors save for me.

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The musical instruments do produce a sound if touched with a woodden or metal stick. My friend Alonso Gomez, mason, has made the cuts with a  1 meter diameter disc.