The fable describes a city that builds taller and taller walls to keep out “trouble.” At first, the walls keep out storms and thieves, and the citizens feel safe. But the walls also block wind and sunlight. Gardens wither. Voices echo strangely. When a child paints a door on the wall, adults laugh—until a real crack appears in the same place. People argue: seal it up, or open it wider? The story ends with the city choosing a gate, and the first fresh breeze in years carries both dust and music.