Final answer:
The second voice speaking to Pi in the poem could represent an inner voice or the personification of the sea, as it expresses a desire for rest and seems to engage in existential questioning.
Step-by-step explanation:
When evaluating the change in the speaking voice within a poem, it's crucial to pay careful attention to the narrative perspective and the addressee. Upon reading the stanzas provided, it seems that the voice speaking to Pi could be interpreted as an inner voice or possibly the personification of the sea. In the lines:
“The voice of my heart in my side or the voice of the sea,
O water, crying for rest, is it I, is it I?
All night long the water is crying to me.”
It suggests that there is a sense of existential questioning and a search for peace or resolution. When reading the last two stanzas with the question of who is being addressed in mind, it's important to look for shifts in tone, perspective, or subject that might indicate a change in the speaking voice or the person being addressed.