See the magic of this pendulum with sand. It is as captivating today as it was centuries ago when Galileo first studied it. Watch unique elliptical loops and swirls take shape as the pendulum sways back and forth through the sand. Features: ~ Stylish and elegant desktop accent ~ Excellent Stress Reliever ~ Demonstrates real science ( the metal pendulum converts kinetic energy into potential energy. When touched, the suspended weight swings freely under the influence of gravity with different start angles creating different sketches on the sand each time.