Page n°9: Sebastiano Serlio explains why he decided to write this book. We can also notice the layout of the text in the shape of a triangle. The lettering is nicely decorated.
Page n°10: We can see the layout that will serve as a model up to the illustrations. It is a description of doors in several points, each point in its paragraph.
Pages n°17-18 : This is the “half of the book”. After page seventeen, there is no more text, only illustrations of doors.
Pages n°111-112 : We can discover the standard layout model for the presentation of the drawings. It is also the only illustration that is accompanied by a plan.