SLEEK, SOPHISTICATED DESIGN: The Swinging Sticks Kinetic Energy Sculpture seemingly defies gravity as the double pendulum creates a fluid, relaxing rotation designed to change speeds 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 no matter where. HOW IT WORKS: the aluminum sticks revolve in a mysterious, perpetual motion, creating an entertaining hypnotic effect. NEVER-ENDING: Continuously rotating, The Swinging Sticks is designed to remain in motion unassisted. The constant, fluid motion is designed to appear like the sculpture is changing speeds and directions while continuously rotating. QUIET: A beautiful piece of art, this kinetic sculpture operates nearly silent and is well recommended for quiet office and environments. A small "tick" sound may be heard at a very low volume. Mode A Powered by 4 AA batteries (not included) Material: plastic colour: black Package Contents: 1 x Swinging Sticks(Not include Battery)