““citizens live almost exclusively underground. You can go outside for exercise and sunlight but only at very specific times in your schedule. You can’t miss your schedule. Every morning, you’re supposed to stick your right arm in this contraption in the wall. It tattoos the smooth inside of your forearm with your schedule for the day in a sickly purple ink. 7:00 — Breakfast. 7:30 — Kitchen Duties. 8:30 —Education Center, Room 17. And so on. The ink is indelible until 22:00 — Bathing. That’s when whatever keeps it water resistant breaks down and the whole schedule rinses away. The lights-out at 22:30 signals that everyone not on the night shift should be in bed.””