Book excerpt: Here is an unprecedented look at the sketchbooks of some of the world's leading street and graffiti artists. It showcases an incredible diversity of working methods, innovative approaches and personal fixations, including declarations of love, typographic explorations, alter egos, storyboards, mythological creatures, anatomical studies, architectural drawings and extreme doodling. They may be diverse, but they all exude creativity and originality. Their publication will be seen as a landmark in graffiti publishing, and the book is set to be a world bestseller.