Tree Marble Run: conifer tree shaped kinetic marble toy cleverly constructed from a single piece of bent rod. Gravity translates to kinetic energy of rotation which carries the marble to the extremity of each branch before it reverses to descend to the next level. An aesthetically simple device that is more challenging to construct than one might think. From Mabro Toys. ➡️ Follow the link in my profile for more info and where to get this and other amazing items featured here on @physicsfun #phys