The Light Across the Courtyard

During evening power cuts, Tessa in apartment 14 and Arun in apartment 19 began signaling across the courtyard. One long flashlight beam meant, “Are you all right?” Two short flashes meant, “Yes.” Three meant, “Do you need anything?” They never exchanged names, but the pattern made dark evenings less solitary.

One Tuesday, Tessa sent the long beam. Across the courtyard came one brief flash, then nothing. She waited and tried again. One flash. The code contained no meaning for that answer. Tessa imagined a dead battery, an injury, or a stranger in the room.

She walked downstairs and asked the building manager to check apartment 19. At the same moment, Arun reached apartment 14 carrying a lamp. The power had returned on his side only, and his flashlight switch was broken. He had used a quick reflection from a mirror, hoping one flash would mean, “I see you.”

They met in the lobby, embarrassed by their crossed journeys. Then they compared assumptions. Their code handled routine reassurance but failed when equipment changed. More flashes would not necessarily solve the problem; they needed a recovery rule. The next evening, they introduced themselves and added one signal: any unfamiliar pattern meant, “Meet in the lobby if safe.” The code became less elegant and more useful. Communication also needs a path for discovering what an unexpected message means.