In Chapter 5 of Literary Theory, Culler mentions that metaphor, as one of the basic uses in language, it is also treated as respectable. He said that metaphor is commonly used to provide a vivid visual image to reader through instance of example, by connecting the knowledge which readers have already known or experience they have gone through, readers can more easier to understand the situation or put themselves into the plot or image(72). For example, in the poem “The sea is history” written by Derek Walcott, the author implies that time locks the history up, but there is no physical barrier which stop people from found it, the author is actually means that all the container of memory, culture, history, are buried under the sea and have been forgotten, as time goes by, these records have become a part of the sea, and the sea have become their container forever until someone discover them and dig them out.
In my view, metaphor is an important way to express the author’s purpose in the article. Metaphor leads reader to imagine and consider what meaning is behind the article from different aspects. It might also encourage people to think creatively and persuade reader to act as well.