I choose a Gyroscope top. It resembles a slick whipping top, which embodies the dynamic equilibrium concept quite curiously.
These objects run thanks to the Centrifuge and Centripetal forces, which result by the momentum of the center load. Since this exercise is centered in laser cutting, I've deliberately ignore the center load that drives momentum, since the tentative materials to solve this cannot be laser cut by the machines in the shop. It would be really cool to have some sort of stone-like material for this exercise though.