Postmodernism says that since peoples' opinions change, and since one person's opinion cannot be more right than another, it means nothing to say that (for example) one work of art is better than any other. Postmodernism says that art, music, and literature, for example, can be anything that its maker says that it is. Postmodern art and literature commonly talk about themselves and make fun of themselves. They make fun of 'serious' art and even the idea of art. Postmodernism has influenced many cultural fields, including literary criticism, philosophy, sociology, linguistics, architecture, visual arts, and music.