Answer:
The stanza is repeated to create rhythm in the poem and to emphasize the idea of living in a big looking-glass.
Step-by-step explanation:
Repetition is a literary device used within the lines and stanzas of poems to stress an idea that the poet wants the reader to take note of and to form a rhythm that makes reading the poem more enjoyable and appealing to the ears. This device also makes the poem easier to recall as it sticks to the mind of the reader.
The repeated stanza of the above poem has an emphasis on the 'a' sound. There is thus a rhythm created that not only makes the poem more enjoyable to read, but also stresses the idea of living in a big looking-glass.