A few months ago, browsing in a used bookstore, I happened across a nice hardback copy of Emile Zola's "Germinal". Force of habit (I often look at favorite books in as many editions as possible) urged me to pull the book off the shelf and I let it fall open in my hands.
Sketches. Surprised, I flipped through the book slowly, pausing every few pages. Lovely drawings by Berthold Mahn, scattered throughout this 1942 edition of one of my favorite books. Some drawings are more detailed and complex (above and lower left), while others take on a cruder, simpler style (lower right). The pictures match the story just right without revealing much for the unsuspecting browser. In fact, lined up and placed side-by-side, these different drawings tell a story of their own. The depth and beauty these pictures add to an already excellent book is surprising, making me wonder why I haven't seen more artwork of this kind.