We found this display on the counter next to the cash register in the sushi restaurant we tried for the first time at lunch. Actually, this is just the top part of it. Water enters this reservoir, and drips down into the pools below. But, here, at the top, in the “shell,” there’s a plastic ball spinning in the flowing water that does a credible job of looking like a “pearl.”
Kinda cool to see this bubbly contraption once, but I wouldn’t want to live with one!