Why is childhood such an important experience in Rilke’s view? In what ways does childhood allow one to change their perspective on the world?

Throughout his letters, Rilke argues that works of art are experiences not easily translated to language, and contain something within them that is ultimately inexpressible. In what ways is this true—or not true?

Rilke’s letters often employ figurative language, such as metaphor and simile. How does such figurative language help make Rilke’s points? Does it ever detract from what he is saying?