Shel Silverstein was a contributing artist to Playboy magazine since its inception, and for over ten years he traveled the world and sent back cartoons about what he saw. The drawings are slightly more adult than those you'd find in one of his children's books, but they are in the same style and equally funny. Also, Shel is depicted as a character in most of these cartoons, which reveals a side to him that I've never seen in his other works. You find out that Shel was (mildly) gored during a bullfight in Spain, hospitalized for months after a car accident in Africa, and snuck into Russia posing as a student. Personally, the whole book is worth reading to see "Silverstein Among the Hippies." It's a quick read, but worth it.
