Hydrodynamic levitation.
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Previously:
https://www.homemadetools.net/forum/...778#post133177
https://www.homemadetools.net/forum/...901#post190896
https://www.homemadetools.net/forum/...917#post190979
https://www.homemadetools.net/forum/...420#post127358
https://www.homemadetools.net/forum/...860#post186858