The biggest trackball

The Big Red Ball has become the world’s largest trackball! This is another 1-day project by Eric Gradman of SyynLabs. I transformed a 3′ walking globe into a trackball. I mounted it on a wooden assembly featuring four ball-transfer casters from McMaster-Carr. I spring mounted a wireless Logitech mouse such that it maintains contact with the underside of the ball at all times. To spin the ball on the casters is to essentially “move the ground beneath the mouse.”

The Big Red Ball keeps winding up in some weird places…