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The Flipped Bit? The Reversed Desrevereht?

(I once read a fiction story about someone who, instead of having perfect pitch, had perfect winding number: he couldn't get to sleep before returning to zero, so it took him some time to realise that when other people talked about "unwinding" at the end of the day, they didn't mean it literally)

[psd1]

Ha. Of course. You need both feet to trace paths of equal length, or their waveforms will interfere, causing amplification and dead spots