In “Leaves of Grass”, Walt Whitman celebrates the human body and the natural world in a collection of poems that are sometimes erotic, sometimes religious, and always joyful. Whitman believed that the body was a sacred thing, and he wrote poems that explore its many forms and functions. He also wrote about the wonders of nature, and the ways that humans interact with the natural world. In addition to these themes, Whitman also wrote about love, death, and the human soul.