SLEEK, SOPHISTICATED DESIGN: The Swinging Sticks Kinetic Energy Sculpture appears to defy gravity as the double pendulum creates a fluid, relaxing rotation designed to change speed and direction for no apparent reason. This high-quality, museum-style motion sculpture gives the illusion of perpetual motion, designed to baffle and amaze all onlookers. Hand-assembled by experienced engineers. BEAUTIFUL ART: Perfect for any environment, The Swinging Sticks is perfect for conference rooms, offices, waiting rooms, display windows, and foyers. This sculpture will provide relaxing entertainment and be the center of attention anywhere. HOW IT WORKS: Powered by 4 AA batteries not included, the aluminum sticks rotate in a mysterious, perpetual motion creating an entertaining hypnotic effect. ENDLESS: The Swinging Sticks rotates continuously and is designed to remain in motion without assistance. The constant, fluid motion is designed to appear as if the sculpture changes speed and direction while rotating continuously. SILENT: This kinetic sculpture is a beautiful work of art and operates almost silently and is highly recommended for quiet offices. A slight ticking sound may be heard at a very low volume. Color: As shown Material: aluminum alloy Package Contents: 1 x Desk Toy Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.