Watch as each action produces an equal and opposite reaction each time you move it. Spin the wheel and metallic balls and rings rock back and forth and spin. Ponder the motion of the planets, learn a bit about physics, or simply enjoy its calming rotation. Fun for kids, it also makes a great desktop decoration for the home or office. Detailed instructions and base are included. Requires 9V battery for operation (not included). Recommended for ages 5 and up.