The Prelude is unsurpassed in its depiction of the writer's sense of self and thinking. It recounts Wordsworth's life from his boyhood until the moment at which he began composing the poem, at the age of thirty, and recalls his defects, anxieties, loves, and goals. The work as a whole is a protest against the violence and injustice done to humanity by civilization, and an appeal for peace. Romanticism was a movement in literature, music, art, philosophy, and other fields of culture during the 18th century. Romantic ideas were developed primarily in Europe but also had an impact on people around the world. Key features of Romanticism include: enthusiasm, imagination, indifference, innocence, integrity, passion, sentiment, and spirit. Enthusiasm is strong feeling or interest directed toward a subject that is believed to be important or worthy of effort. In poetry, for example, enthusiasm can lead a poet to write with great energy and creativity. Enthusiastic poets may use obscure words or phrases, employ metaphor, adopt unusual structures, or vary the tone of their poems. They may even seem childish or irrational when not tempered by reason and judgment. But enthusiasm is what gives birth to greatness; therefore, it is essential for artists, scientists, and others who aspire to produce works that will endure. Imagination is the power of the mind to create images or pictures in thought or memory.