Leonardo da Vinci believed that to depict the physical world accurately one must first understand its underlying processes. Driven by the need to explain new concepts and enlighten the public, art and science combined to form an enduring relationship during the Renaissance, creating artwork that was not only beautiful to behold but also informative in its content. Today, National Geographic Society artists continue in this tradition, employing contemporary illustrative techniques to enlighten readers of Society publications. Throughout the Society's publishing history, beginning with the magazine's first issue in 1888, diagrams have played a key role -- explaining the hows and whys of the world. "Inside/Out" draws from this vast collection, showcasing a selection of the best diagrams and cutaways from the last 30 years. Lavishly illustrated, the volume is divided into three sections: "Beneath the Surface," which features cutaways that slice away exterior layers to reveal the hidden structure of objects -- from the Vatican's St. Peter's Basilica to the center of the earth. "How Things Work," which displays the diagramm