“Sabbatical, I realized, was an exercise in relativity. Our new experiences and the emotions attached to them created new memories and changed our characters. Time had passed slowly for me and my family. It was so thick and heavy we could nearly grip it. But for my professional colleagues who were engaged in the daily routines of work and home, their more linear stretch of time marched ahead briskly like soldiers on parade. Routine made their lives easier—they didn’t have to think about or choose what to do next. Habit took over, hiding the passage of time and draining it from awareness.”