Physics demonstration desk toy that makes a brilliant alternative to the universally popular Newton's Cradle. Galileo's Pendulum consists of 15 metal balls supported by strings that descend on a slight gradient. Use the wooden block included to push all of the balls at the same time and set them swinging from side-to-side simultaneously. As the balls move back and forth they will gradually go out of time with one another, causing them to swing in a slithering snake like motion. This hypnotic physics effect is mesmerising to watch and makes a perfect executive desk toy, school demonstration or novelty for the home.