Three short lines, and almost nothing happens: it's raining, and a single reed is touched by something. But the last line makes the moment bigger than it first seems. The reed isn't just brushed by a breeze; it touches "all the wind," as if this one rough stalk in a marsh were meeting the whole sky's movement at once.
The speaker never says how they feel, which is part of the point. They seem to be watching quietly, close enough to notice a single reed and its texture. The word "rough" gives the scene something physical and unpolished, not postcard-pretty. The dash after "rainy day" works like a small pause, a breath before the eye settles on the reed.
The mood is hushed, patient and a little awed. Judging by the title and imagery, the poem suggests that paying close attention to something small can open onto something vast.