When most readers think of book design, they focus on the exterior aspects: the front and back covers, the jacket, the spine. Interior design is often overlooked and underestimated, and yet the work that goes into designing the words on the page is just as intensive and can be just as creative as the work that goes into designing covers. And just like cover design, different genres have different challenges and style trends for interior layout. The cardinal rule of interior layout is that the design must be invisible: the choices shouldn’t be so obvious that they distract the reader from the content of the book.