Equality by Edward Bellamy

It was after dark when we reached home, and several hours later before we had made an end of telling our adventures. Indeed, my hosts seemed at all times unable to hear too much of my impressions of modern things, appearing to be as much interested in what I thought of them as I was in the things themselves.

"It is really, you see," Edith's mother had said, "the manifestation of vanity on our part. You are a sort of looking-glass to us, in which we can see how we appear from a different point of view from our own. If it were not for you, we should never have realized what remarkable people we are, for to one another, I assure you, we seem very ordinary."