The last two lines of "Song of Clouds" are: "Like the moon, I fly towards the sky without signposts, / forever flying alone, and return with nothing to gain."
These two poems describe a lonely, long journey without direction and destination. This journey takes place under a sky without signposts, indicating the confusion and uncertainty of the journey. And the end of this journey seems to be forever unreachable, because "it returns with nothing to gain." This depicts a deep sense of loneliness and loss, as if searching for something or a goal but never being able to find it or achieve it.
At the same time, these two poems also have a recurring rhythm, as if they are describing an endless journey. This may imply that the poet is experiencing a spiritual journey, perhaps looking for some kind of spiritual satisfaction or understanding, but has never been able to find or achieve it.