Each planet has its own, independent orbit; 36 turns of the crank take them through a complete cycle and finally bring them into alignment. The drive belts are made of wooden beads and leather thongs. The screws that power the pin wheels are made of washers that have been split, spread, and mounted on shafts.

Below is a video of Jasper in action. If, for some reason, you can't see it, click here.