What metaphors are used in 60 by Rabindranath Tagore?

Unity is an underlying metaphor in the poem. Tagore repeats the first sentence or a variation of it four times in the poem: "On the seashore of endless worlds children meet." No other line or phrase is repeated this many times in the poem. When a poet singles out a sentence like this and repeats it several times, it generally means that he or she is trying to reinforce an idea. In this case, Tagore is underscoring the idea of a meeting. This meeting is among children, who have traveled from "endless worlds."