This wonderful artwork combines different fields of physic: Newton's laws of Motion, Optics, and Electricity.
Unfortunately there are thousands of posts around but without mentioning the artist. Sorry.
"Newton's cradle, named after Sir Isaac Newton, is a device that demonstrates conservation of momentum and energy via a series of swinging spheres. When one on the end is lifted and released, it strikes the stationary spheres; a force is transmitted through the stationary spheres and pushes the last one upward. The device is also known as Newton's balls or "Executive Ball Clicker"."
Via Annie Show