Complexities and challenges of creating rich digital books. This lecture will highlight the new skills required and the relationships between authors, designers and software developers. The business case provided by "The Elements" and why maniacal attention to quality repays the effort. --- "Tablet computers such as Apple's iPad and its many imitators are enabling a new industry publishing books made of binary bits not pulped trees. But what will the best of these books be like? It is not enough simply to convert static pages into digital form, perhaps adding a few bells and whistles such as clips of video. Instead the whole reading experience must be redefined for the interactive medium, critically preserving and enhancing all that is wonderful about the printed word. Using the examples of The Elements and Solar System, both best-selling titles for the iPad, this presentation will show how imagination and obsessive attention to detail can achieve great results and rich commercial returns."