As surely as Pavlov's pet knew anticipation
I know

I have many such bells in my head
Associations that are countless:

Between perfume and a lover's touch
Chills across my shoulder blades when I see
A red dress float by a café window

This is why the French gave a word
To a single discrete sound
So subtle
And yet infinite

Frou frou

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title from Merriamwebster.com