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You could always tell what kind of a person a man thinks you are by the earrings he gives you. I must say, the mind reels.
— Holly Golightly • Breakfast at Tiffany's

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
She says you can always tell how a man sees you by the earrings he gives you, and the verdict is a bit horrified. 'The mind reels' is a wry, theatrical way of saying she's dizzy at what those gifts imply.
Context reviewed