ah, but we're talking about cross-purposes here. you're talking about the expectation, which comes from the reader and is imposed on the poem. i'm talking about the function, which is built into the poem and flows from the writer to the reader.
no matter why one reads, when one reads a poem like this, one can find nothing but what is there. you can look for a hidden meaning, but you won't find it. you can look for metaphor, and you might find it, but it would be a connection in your own mind and would (in my opinion) lie outside of the poet's intent.
now, you might reject the image. deem it interesting or not, find it evocative or not. but your reasons for reading don't enter into what it is...
not a critique of your comment, paint... but just some general thoughts on the nexus of the author's agenda and that of the reader.