My favorite piece of art so far.  This is a fountain, carved out of local rock that was dragged from British Columbia by a glacier, and left on a Bellingham street.  The ball is 40-inch sphere, and it basically floats in a socket that is just a tiny bit larger.  Water is forced in the socket under pressure, and though the ball weighs tons, you can move it with a gentle shove.  I have seen these with a three inch ball, but this is cool.  I plan to sit out by it in the sun and rain, listen to the water, watch the ball slowly turn, and then contemplate my navel.  I mean, think deep meaningful thoughts.