Twilight pictures the sun and moon as two friends who are always playing a game of chase across the sky. They hide among the stars, slide down the Milky Way, and fill space with joy. The humans below get to enjoy the result: the colorful sky of twilight, which the poem treats as something the two make together.
But the mood shifts near the end. The sun sets, the moon shines alone, and the pair stay separated until dawn. The speaker seems to feel both delight and a quiet sadness. The playful opening, with its light rhymes and childlike imagery, gives way to a gentler, more wistful tone. The line "Friends forever and forever away" sums up the idea neatly: the bond is real, but distance is part of it. The closing couplet, "Never speaking too much, / For the sun and moon can never touch," leaves us with a bittersweet picture of closeness that can never quite be complete.