Unfolded Physics on Instagram: "This battery-free kinetic sculpture works on stored mechanical energy. With just a single twist, a hidden spring winds up — and as it slowly unwinds, it releases that energy into a series of precision-cut Eucalyptus and Ash plywood blades. Each blade is angled and spaced to create a continuous wave-like motion, so the energy transfers smoothly down the mechanism for up to 15 minutes of movement. There’s no motor, no battery — just clever engineering, friction cont