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.

Creates beautiful patterns on sand
Sand pictures are written and rewritten for over five minutes
Instruction manual included
Makes a lovely gift for anybody

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!