Please give some literary devices that are used in "I Am Vertical" by Sylvia Plath.

This poem is based around two central comparisons that the
speaker of the poem makes between herself and then a tree and a flower. It is this sense
of kinship--or the lack of it--that is explored through the poem. Note how in the first
stanza, the speaker begins by stating how she is different from these two objects. The
speaker says that she is "not a tree with my root in the soil" and likewise she is not
"the beauty of the garden bed." The speaker, by using these negative metaphors to
describe what she cannot be compared to, distances herself from these lovely and
fruitful images. She is not like a tree that will "gleam into leaf," and neither is she
beautiful and a sight that attracts the appreciation of others. Her desire is to have
the "longevity" of the tree and the "daring" of the flower. It says a lot about the
speaker that seeing nature makes her aware of her deficiencies. However, it is at night
when the speaker imagines lying down that she can be "useful" and have communion with
these aspects of nature:

It is more
natural to me, lying down.
Then the sky and I are in open
conversation,
And I shall be useful when I lie down finally:
The the
trees may touch me for once, and the flowers have time for
me.

Is this a veiled reference to death
and how our dying brings us closer to nature when we become one with the earth? Lying
down "finally" perhaps would indicate this. Certainly a lot of Plath's poetry uses
imagery and symbolism relating to death and dying, so perhaps this is
possible.