what does a halo have to do with anything?

I have pondered over this poem for a while now and i have thought and came to several conclusions on what it might be about. I still cannot figure out what it could possibly be about, but then i realized that it doesnt matter if u know exactly what its about just as long as u have some thought about it, its ok!

The poem is "The Halo That Would Not Light" by Lucie Brock-Broido, and it sounds like one giant metaphor. She starts out by placing this person into the mouth of a bird, a raptor, and says that the person is dropped...into a carriage...i got the picture of a child being dropped into a carriage and as soon as he or she was in it he or she became an adult. As the poem gors on she refers to the person as a childs cardboard box...maybe a metaphor for becoming dull? I say this because then right after she states something about swings being empty and the catastrophe of childhood being done...so the person is done with childhood imagination and is now as plain as a childs cardboard box.... I just talked myself through what i think the poem is about...weird.