W. B. Yeats wrote The Lake Isle of Innisfree as a young man and collected it in the The Rose sequence (1893), from his early Celtic-Twilight period. Innisfree is a real, tiny island in Lough Gill, County Sligo, the country of the poet's childhood. The poem is a dream of withdrawal: to build a cabin there of clay and wattles, plant nine bean-rows, keep a hive, and live alone "in the bee-loud glade".
All its force is in the final turn. The first two quatrains paint the idyll — the peace that "comes dropping slow", the purple glow of noon, the linnet's wings — but the third reveals where the dream is dreamed from: "While I stand on the roadway, or on the pavements grey." Yeats wrote it in London, homesick, when a little fountain in a shop window brought back the sound of lake water. The island is not in Ireland: it is "in the deep heart's core".
It is one of the best-loved poems in the English language, and already sets the music that would win Yeats the Nobel Prize in 1923: the Irish cadence, the longing for a place, and the hypnotic pulse of "I will arise and go now" that opens and reopens the poem.