Rolling Ball Perpetual Marble Machine, Kinetic Art Perpetual Motion Machine, Perpetual Marble Machine Science Physics Gadget Office Home Desk Ornament.
- ... The perfect gift for holidays and birthdays: The funny perpetual motion desk toy can also be a perfect gift for kids adults, such as birthday holiday, christmas etc. This Rolling Ball Perpetual Marble Machine is fun and practical for kids who want to learn more about electricity, magnets and physics..