Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Postmodern picture books are a specific genre of picture books. Characteristics of this unique type of book include non-linear narrative forms in storybooks, books that are "aware" of themselves as books and include self-referential elements, and what is known as metafiction. A classic example of this genre is David Macaulay''s award winning Black and White (1991). This book consists of four "separate" sub-plots which are related, but the reader must decide in what way the story becomes meaningful. The inside front cover of this book, awarded the Caldecott Medal in 1990, states: "WARNING: This book appears to contain a number of stories that do not necessarily occur at the same time. But it may contain only one story. Then again, there may be four stories. Or four parts of a story. Careful inspection of both words and pictures is recommended."