Two small images sit side by side here, and the poem's quiet charm comes from how they fit together. In the first, morning is "laid out" over all the ships, as if the light were a cloth spread gently across the harbor. The phrase makes the whole waterfront feel calm, wide, and still, with the day just beginning.
Then the view shifts from the big scene to a tiny, close one: a child drumming happily on a window. We never see the child, only hear the sound in our imagination. The speaker seems to be watching from indoors, perhaps from the same window the child is tapping on, though the poem doesn't say so.
The speaker doesn't announce a feeling, but the mood is easy to sense: peaceful, warm, and a little amused. The child's playful noise brings energy and joy into the stillness, and it makes the vast morning feel lived-in and human.