Monday, 6 AM. You have the tray and the room has opinions. Every coffee you pour adds a regular to the line behind you, and the line follows exactly where you walked. That is the problem. The line must never meet itself, the walls of an 1855 bank do not move, and antique weekend keeps leaving tables where you want to be.
Arrow keys steer. On a touch screen, swipe. Decaf thins the line out when things get desperate, tips are worth a detour, and the pace only ever quickens. Old timers say the back office computer still runs a version of this. It answers to the letter B, or a tap on the sign above the door.