Zenosaurus Curriculum 2: We usually understand things by taking them up to the top floor of the mind and finding a slot they fit into. Koans are meant to open a different way of being and thinking. Instead of preparing you to understand your life, a koan prepares you to walk through your life.
Zenosaurus Curriculum 1: When the Buddha was growing up, his father kept four sights from him. The forbidden sights were a sick person, an old person, a corpse, and a pilgrim dedicated to the meditation path.