The poem looks closely at one ordinary scene: a cement laundry building on a street corner, caught in strong sunlight. The speaker describes the white paint peeling under the sun's glare, and the tall, narrow windows with their blue, bubbled glass. Some light bounces off them, but most seems to sink into the blue, like something drowning in water.
The last two lines step back and give the sun a human quality. It shines on one side of the building and "forgetting" the other, as if it were careless or distracted. That small touch shifts the tone from plain observation to something quietly wistful.
The speaker doesn't state any strong emotion, but the details suggest a mood of fading and neglect. The paint is worn, the building is unglamorous, and half of it is left in shadow. The mood is calm, still, and a little lonely, with a gentle sympathy for something overlooked.