Why does the water spray landscape spray water from the mouth of the stone carver?

The water-jet stone carving beads you mentioned are called feng shui balls in the stone carving world. As shown in the following figure

The lower part of the ball is hollowed out, and a groove is made according to the size of the Feng Shui ball. A water pump with enough power is installed below, and the water is pumped up through the built-in water pipe in advance, so that the water flow can push the balloon to rotate.