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.
"This one is an IBM smart cities campaign product/ad. It is great because it is intelligently complementing the ad with the functionality of the design, so perfectly that the audience really gets the idea of the “Smarter Cities” out of this design.