The book Return of the Straight Dope (copyright 1994) has this question "Why do so many public buildings want you to use the revolving doors rather than the reg

The book Return of the Straight Dope (copyright 1994) has this question "Why do so many public buildings want you to use the revolving doors rather than the regular doors?" After a brief discussion about protecting against loss of air conditioned or heated air, Adams concludes with: So much for the rationalizations. The real reason you're told to use the revolving doors is so the real estate operators of the world can test your willingness to play ball. Do you follow directions and use the revolving door, or are you one of those independent types who insist on doing their own thing and entering through the swinging version? If the latter, be forewarned: when Donald Trump takes over, you're history. I thought it was funny at the time.