My favorite poem of the group was "The Onion." No, not just because of the hilarious alternative newspaper, The Onion, but because it outright abused the word "onion." There are other reasons, too. The poem does have some interesting ideas about self-awareness and perfection of make-up.
As the poem states, as one takes apart the layers of an onion, there is only more onion, or as the poem says, "Inside it, there's a smaller one/of undiminished worth." As the last stanza reminds us, humans are not like onions. We hold different things in our bodies, like "veins, nerves, and fat,/secretions' secret secretions."
There is also the self-awareness issue. One has to have a little extra knowledge of the poems outside of "The Onion," but taken with "View from a Grain of Sand," one can see that, this poem, too, has a theme of the onion being perfect without being aware of its perfection. There seems to be some quality of self-unawareness that is beautiful and grand. People, as I'm sure we all know, are all too aware of themselves and what we are, and only strive to find out more. Onions and sand do not do this, and thus are favored by Mother Nature.