Not every idea a writer presents is as important as every other idea. Many ideas serve to support the key ideas being developed. Effective writing, then, helps the reader distinguish between the more and the less important ideas by emphasizing the more important ones. Many of the devices in this book are suitable for creating emphasis be cause they call attention to words or ideas by the structure of presentation. (You saw an example of this with antithesis in the previous chapter.) The devices in this chapter and the next are especially useful for emphasis.