"I Wandered Lonely as a Cloud" is one of the most famous and best-loved poems written in the English language. It was composed by Romantic poet William Wordsworth around 1804, though he subsequently revised it—the final and most familiar version of the poem was published in 1815. The poem is based on one of Wordsworth's own walks in the countryside of England's Lake District. During this walk, he and his sister encountered a long strip of daffodils. In the poem, these daffodils have a long-lasting effect on the speaker, firstly in the immediate impression they make and secondly in the way that the image of them comes back to the speaker's mind later on. "I Wandered Lonely as a Cloud" is a quintessentially Romantic poem, bringing together key ideas about imagination, humanity and the natural world.