In these lines, a shadow and a bluejay draw the speaker’s attention upward, and the sky suddenly becomes a strange, moving thing. At first it seems caught on a poplar tree, but then it jerks away and keeps drifting farther off. The speaker imagines it is tied with chains and pulled from above, like a kite or a balloon no one can hold.
That image gives the poem a playful, wondering tone, but also a hint of sadness. Each time the speaker looks up, the sky is still slipping back, always out of reach. There is a quiet lonely feeling underneath the simple words: the sky—something huge and familiar—keeps retreating, as if it has its own intentions. The mood feels dreamy and a little uneasy, mixing childlike curiosity with the sense of watching something beautiful get farther and farther away.