Architectura civil recta y obliqua consists of 3 volumes, of which the first one uses illustrations solely to end paragraphs/subjects and mainly focuses on geometrics and mathematics in architecture using a lot of tables and numbers (therefore mainly schematics), and the last one only consists of illustrations.
The books have a lot of walls of text, and are very rarely structured by paragraphs. Often, text is also structured in tables in combination with numbers. They are divided into Partes and subdivided into Articulos, Seccions, Reglas, Principios, Definicions and Proposicions, which can be distinguished from the rest due to their centralized positions and larger font sizes.
In total, Architectura civil recta y obliqua consists of 167 illustrations. Most of them can be found in the last book of the oeuvre. In the first two books they cover very small parts of the pages, aren’t of very high importance compared to the text and are mainly used to end paragraphs or explain something quickly. In the last one they usually cover one page but take up the space of a double page, meaning the left one is left free. The content can be put in a variety of categories, from architectural drawings to details, from pieces of art to simple geometry. Usually the images are referenced in the text and they are supposed to be looked at while reading the other two books.
Initials are often decorated and highlighted when starting a new paragraph or even sentence, which can be connected to the time in which the books were published as it was fairly common to do so.