In 1998, a pair of Buddhist meditation teachers named Michael Roach and Christy McNally had a very unconventional marriage ceremony in which they vowed to “never separate, night or day.” They meant that a little more literally than most couples do—for the length of their marriage, Roach and McNally were never more than 15 feet away from each other. Where one went, so went the other. If Roach woke with a burst of inspiration in the middle of the night, McNally followed him to his office. If they couldn’t be seated in the same row on a plane, they’d skip the flight. Unfortunately, all this closeness didn’t help save their marriage, and they divorced in 2010.