How does the poet describe the pupa stage of a butterfly's life in the poem, Lepidopterology?

During the pupa stage, the caterpillar surrounds itself for one to two weeks in a protective covering that hangs from a branch and allows the pupa to undergo an internal metamorphosis, during which it develops its adult organs. The speaker describes this phase as involving a "total paralysis of the will," which is an example of the literary device of personification, because it attributes human characteristics to an insect.