I am not a tree with my root in the soil
Sucking up minerals and motherly love
So that each March I may gleam into leaf,
Nor am I the beauty of a garden bed
Attracting my share of Ahs and spectacularly painted,
Unknowing I must soon unpetal.
Compared with me, a tree is immortal
And a flower-head not tall, but more startling,
And I want the one's longevity and the other's daring.
Tonight, in the infinitesimal light of the stars,
The trees and the flowers have been strewing their cool odors.
I walk among them, but none of them are noticing.
Sometimes I think that when I am sleeping
I must most perfectly resemble them --
Thoughts gone dim.
It is more natural to me, lying down.
Then the sky and I are in open conversation,
To sleep, perchance to dream… 
 In sleep, the speaker can relate most closely to the natural objects that have been described. They are similar by existing passively.
I Am Vertical