SCIENCE MODEL- Magnetic swing: As a three-dimensional ball, moving smoothly, swaying from side to side, it will be a beautiful scenery on the desktop. Also great for science enthusiasts or for demonstrating the laws of physics in science classrooms. ROTATING ART ORNAMENT- This balanced movable kinetic galactic motion toy is ideal for use on any desk or home or office table as a decorative piece or as a rotating piece of art for your desk. CUTE GIFT- The perpetual motion desk toy is perfect for decorating space-themed offices or rooms exterior. HIGH QUALITY- Easy to install and disassemble. Great gift idea for your friends and family. A simple twist of the top of the base sets the galaxy in motion. NOTE- Requires battery to operate. Once the batteries are in, it will stay on and on until you stop it or turn it off. Battery not included.