Foucault Pendulum

This simple device with a black stand is the perfect size to sit on your desk, with its rhythmic motion inscribing beautiful patterns in the sand. The Foucault's Pendulum is a simple pendulum apparatus with a sand bath at the bottom. When you set the pendulum in motion, it goes about marking lines and curves on the sand. While it may not make much sense to you in the beginning, take a look at it after 5 minutes or so, and you're sure to marvel at the geometrical designs that it has come up with! Add a touch of class to your office desk. It would also make an excellent gift idea for your boss (especially when appraisal time's nearing!), girlfriend, or dad!