When Roger waved his library card over the automatic self-checkout machine’s reader, he got a message on the screen instructing him to visit the main desk. Dutifully, he picked up his books and did so. “Must be something wrong with the machine,” the woman behind the counter said with a shrug. “Your card seems fine.” But then the same thing happened with his card again the following week, and then the week after that. And Roger could clearly see that there was nothing wrong with the machine. Other people were using it right and left.
So when it happened a fourth time, Roger asked the woman behind the counter why he was unable to use the self-checkout machine if there was nothing wrong with his card and nothing wrong with the machine. The woman opened her mouth as if to say something, but stopped short and said, “Let me just check with the head librarian.” She ran off and came back a minute or so later, followed by a slightly older woman of the same general appearance. “There doesn’t seem to be anything wrong with your card,” she said to him, as if that were an explanation, and then she proceeded to help him check out his four or five books on political history and electrical engineering that he had chosen this week. Before he left, he glanced at the original librarian, who was staring back at him with a sorrowful look, making expressions with her eyes as if there was something obvious that he didn’t understand.