Asyndeton adds to the poem's casual, conversational tone. The device first appears in lines 7-8:
This audacious, purifying,
Elemental move.
The speaker is describing how people are expected to react to the idea of someone running away from it all. The lack of any conjunction here speeds up the list of adjectives, creating momentum and excitement. The device recreates the awed tone that tends to accompany these mythical "departure" stories.
The asyndeton in line 14 again mirrors the poem's content. Here, the speaker describes their "specially-chosen junk":
The good books, the good bed,
Placing each item on either side of a caesura, without any conjunction between them, creates a sense of balance and steadiness. The line is neatly divided into two equal halves (three words on each side), evoking the staid predictability of the speaker's everyday life.
The poem's final two lines feature more asyndeton:
Books; china; a life
Reprehensibly perfect.
Now, the list feels less breathless and more boring. The speaker nonchalantly places "a life" right alongside "Books" and "china," the asyndeton not allowing for any hierarchical distinction between these things. This, in turn, reflects the speaker's point: that "departing" just turns life itself into another object, something no different from the carefully chosen books and dishware with which people fill their homes.