Rolling Marble Sculpture: https://www.physicsfunshop.com/search?keywords=rolling marble Marbles perform gymnastics as potential energy of gravity is converted to kinetic energy. An elegantly designed auger conveyor, an Archimedes' Screw, brings the marbles back to the top (powered by an AA battery and a small motor). Conservation of angular momentum produces a simulation of decaying orbits as the marbles whirl down the the main funnel shaped feature. Made with recycled wood by artist Bogdan Krup