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... ball around the center. It's the start and end Theta that @adambrower is asking about. Most people are familiar with 2D Cartesian geometry, where the two axes are called "X" (horizontal) and "Y" (vertical) - the Classic example is an Etch-a-Sketch. But Sisyphus uses polar geometry (hence the different axis names). Like the X and Y of the Etch-a-Sketch, the Rho axis has limits - if you go too far in either direction you hit the "end of the track." If this happens with your Sisyphus, it makes a knocking noise, which doesn't hurt the mechanism, but is no fun t ...