E. Nesbit,
Man and Maid — III. The Stranger who might have been Observed
(1906)
“ Perhaps you do not know that there are ways of observing strangers other than by the stare direct. He looked sulkier than ever: but he also had eyes. Yet he, too, was far from staring, so far that the indignant Nina broke out in a distracted whisper: “There! you see! I’m not important enough for him even to perceive my existence. I’m always expecting him to walk on me. I wonder whether he’d apologise when he found I wasn’t the station door-mat?”The stranger shrugged his shoulders all to himself in his second-class carriage when the train had started. ”
