A woman sweeps a concrete floor, and the speaker turns that ordinary chore into a small performance. The broom "dances," swaying and humming, while the dust it stirs up rises like a "brown storm." The dust and air move together, as if they were keeping time to a rhythm only they can hear.
The speaker seems quietly amused and a little wistful. They notice something the sweeper doesn't: a "fest" is happening right in front of her, and she has no idea. The last lines turn to her mind, which the speaker says is as oblivious as the world around her. We can read that as gentle observation, or as a hint of sadness about how much of daily life goes unnoticed.
The mood is calm, playful and reflective. By watching closely, the speaker shows that even something as plain as dust can hold a kind of beauty.