An undertow is a steady
offshore-directed second-order flow,
i.e. it is proportional to
the wave height squared. Meaning:
No wave can arrive completely
without also leaving.
It will always contain
some percentage
of its own opposition,
no matter how it tries
to keep it down.
You are a physicist,
and so of all people
should understand
compensation,
that a wave’s nature
is intrinsically
antagonistic,
and that any assumption
of linear behavior,
at least in this model,
is most likely invalid–
OPTIONAL POETRY 
Ha ha ha!
That made me laugh and I barely understood it.
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🙂
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Brilliant!! Thank you!
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Thank you, Niklas!
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love it, thank you. impressive, too, that you can articulate such a vast understanding in so few words.
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Thank you, Shellie! Although if you asked me to calculate some of things, it would be a completely different story… 🙂
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