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Off-topic. But what is

>the same useful way we approximate the speed of light in relativity.

in reference to?

Just an analogy that emphasizes reflexivity. Words and light in this case. Maybe a stretch?

Relativity is not about approximating the speed of light. So yes, probably a distracting stretch. YMMV.

Fair enough. Loose analogy straight from my own neuralese. Corrected.