 For example, the trope notably appears in Henry David Thoreau's "Walden" (1854) when the whistling sound of a steam locomotive disrupts the natural landscape of Walden Pond.Marx uses this literary metaphor to illustrate the relationship between culture and technology in the United States as depicted in the work of American authors such as Herman Melville, Ralph Waldo Emerson, Nathaniel Hawthorne, Henry David Thoreau, Mark Twain, Frank Norris, Henry Adams, Henry James, and F. Scott Fitzgerald.Marx identifies a major theme in literature of the nineteenth century—the dialectical tension between the pastoral ideal in America and the rapid and sweeping transformations wrought by machine technology.