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This simple yet elegant device is ideal for your desk with a black stand. This Pendulum creates gorgeous and complex geometric patterns in the sand with its rhythmic motion, and the designs are never the same! It's both therapeutic and addictive. Foucault's Pendulum was initially used in 1851 to demonstrate that the Earth did, in fact, spin. It was named after the French physicist Léon Foucault. Bring this modern version home and watch the pendulum swing through the fine sand, creating a constantly changing geometric pattern. As the Pendulum arc varies, the patterns get larger, smaller, and larger. The period, or the rate at which the pendulum swings, is unaffected by the bob's mass. Instead, the length of the swinging arm is the most critical component. Ideal for the procrastinating professional to proudly display on a desk at work or home.