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The poem Dui Bon by Rabindranath Tagore expresses the poet's longing for his beloved and describes visiting her home by the river at night while she sleeps, with the poet feeling joy at being near her even though they cannot meet. The poem uses imagery of the moonlight and river to convey the poet's emotions of love and separation from his beloved. It highlights the universal themes of love, longing, and the joy and pain of being close yet apart from someone special.