The figure of speech in line 15 is known as personification and it signifies that the mountain does not care about the city, as further explained below.
What is personification?
The figure of speech known as personification consists of saying that an object or natural phenomenon has human characteristics or behaves in a human-like manner.
In line 15, we are told that "The shoulder of the mountain shrugs away its lights." The action of shrugging is typically human, that is, it is something a mountain cannot do. That is why we have personification here.
The significance of the personification above is that the mountain does not care about the city. When we shrug, it is a sign that we do not care about or do not know something.
Learn more about personification here:
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