Here, both the title of the poem and its first sentence uses the same simile. In this as in other literature examples, the simile uses a mental image to create a mood and illustrate an idea.

Watch out! Don't confuse similes with metaphors. 'The snake moved like a ripple on a pond.' 'It was as slippery as an eel.' 'Jess is as graceful as a gazelle.' In her poem George Square ...