Abstract: A device for storing and delivering rotational energy for rotation of a mobile is used in combination with a source of rotational energy and a control device adapted for intermittent actuation of the energy source for a predetermined period at predetermined intervals. The energy storage device has at least one multi-filament non-braided cords connected between first and second cap members. The first cap member is detachably connected to the energy source and the second cap member is detachably connected to the mobile. The cords are wound by and in response to actuation of the energy source, and urge the mobile to rotate following deactivation of the source. A method of constructing a plurality of the energy storage devices is also disclosed.