Corrected entry: On Krypton, the rings circling and revolving around Zod and company go from revolving smoothly to slightly lopsided and back.
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Correction: They're meant to be some kind of prisoner restraint device. It's never explained how it works, but presumably, the rings emit some kind of force field. Varying the speed and direction of the rings' rotation would then be a way of keeping the prisoners from detecting a pattern and escaping.
Captain Defenestrator