A reflective marble rolls a continuous kinematic loop through ramps, a tube, a funnel and a spiral track mounted on a wooden frame. Real marbles like this one are typically dense glass or steel ball bearings, and once released they follow the same rigid-body rules as any rolling sphere: gravity accelerates it at 9.8 m/s^2, while track curvature converts height into speed via conservation of energy. On tight loops and helical spirals, the marble needs enough centripetal force (v^2/r) to stay pressed against the track instead of flying off, which is why real toy marble runs widen or flatten their spirals near the bottom where speed is highest. Polished glass-on-wood contact has a fairly low rolling-friction coefficient (roughly 0.01-0.02), letting a marble coast for many meters from just a modest starting height. Drag to orbit, scroll to zoom.