This book cover shows excellent figure ground/negative space. The contours formed by the position of the fox serve as the shape of a boy, I'm assuming "Peter." This empty space also creates a wonderful focal point for the book title to nestle into.
I love the first poster for this movie "You Will Meet a Tall Dark Stranger" the latest woody allen film. The negative space created with the hands is beautiful. Here is the feature film trailer for the movie "You Will Meet a Tall Dark Stranger"