The 16-pound, 8.5" diameter
(denser than water) bowling ball is supported by a thin film
of flowing water. If the ball is rotated, it will
continue to rotate for a long time since the
only frictional force is the viscous drag between the water
and the ball.
Water from the tap enters the
base from the side and emerges from a hole in the center
beneath the bowling ball. The tarp directs the runoff into the
sink.
The base has the same curvature as the ball, since it was cast
in dental stone from the ball.
