The molecule like trios of spheres on this desk top mobile spin and twirl gracefully as the central pendulum swings the motion is continuous and at first glance impossible to fathom the secret lies in the base a battery powered motor spins a powerful magnet which in turn exerts a force on the pendulum which in turn incorporates magnets that influence the movement of the three 39wheels39 even when you know exactly how it works the perpetual rhythmic movement and gravity defying st