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2) She fixed her eyes upon him, and there was something in their character that reminded him of large, polished buttons; he seemed to see the reflection of surrounding objects upon the pupil.
The expression of a button is not usually deemed human, but there was something in Miss Stackpole’s gaze that made him, as he was a very modest man, feel vaguely embarrassed and uncomfortable.
by Henry James from The Portrait of a Lady (1881)
Blush of Dawn 