Little Blue and Little Yellow In 1959 this book launched Leo Lionni's career as one of the most honored and beloved children's book authors of the 20th century. The original publisher was sold to a magazine publisher in the 1960s and the book has been virtually out of print in hardcover for many decades. Knopf is proud to add Little Blue and Little Yellow to its list of Lionni classic picture books. This 50th anniversary edition will include Leo Lionni's own explanation of how the book came to be during a train trip with his two young grandchildren. Lionni is at his very youngest and most original in this story about two friends, a piece of torn blue paper and a piece of torn yellow paper --until their hug turns them into one green piece. How they reclaim their true colors is a delightfully satisfying conclusion. Hardcover 10/13/2009