The interplay of light and dark is a guiding thread of the poem. In the second line, the speaker describes the sky as “Enwrought with golden and silver light” (Line 2), a reference to the sun, moon, and stars. He takes the image further by exploring “The blue and the dim and the dark cloths / Of night and light and the half light” (Lines 3-4). This encompasses not just one moment, but the entire spectrum of what the sky can be. It’s characterized by its variants of light and darkness, which in turn represent the spectrum of passionate love.