proximidad This Coke advertisement uses contrast (white and red color) and repetition (repeat bottles of coke) to strengthen the product. Also its shape looks like a big smile, which is related to happiness.
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.