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William F. Coleman: "A lot of people find the exposed pipes, air vents etc. to be off-putting. I don't. But one year I was teaching a small (15 students) class in a room with an air vent hanging down from the ceiling in the middle of the front of the room. One day, when I still occasionally used lecture notes, I was blabbing away and suddenly decided that I wanted to talk about something else. Without thinking, I threw the notes into the air, and they disappeared up the air vent. The problem was that they got stuck, and for many months you could hear the rattling of paper overhead when the room was moderately quiet."