backyard water lift
In 1960, we had a backyard pool that was about 20 inches deep and about 7 feet in diameter. Using an inflated inner tube (from a car), I sat in the tube, in the center of the pool, while my brother pushed the inner tube down, making all the water swish up the sides of the pool. Then the water from the sides all swooshed back down again, creating a column of water in the center, which lifted me about four feet in the air. This ride would continue, alternating from touchdown to lift-off. We all took turns having the ride of our little lives.