Water flows tangential into the bottom of a clear acrylic tube and swirls around a central hole. The hole is just big enough for plastic play balls to fall through. The flow into the bottom is enough for the tube to quickly fill with water and overflow the upper rim a bit. As the water fills up the tube a central air core vortex hole forms in the middle of the water. Balls dropped on top of the swirling water orbit the central hole with increasing speed, and then drop down through the hole in the bottom of the tube and then reappear on the exhibit deck plate surface that is under the vortex. Adjustable nozzles allow visitors to experiment with the vortex formation inside the tube.
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