The three pages here reported are from Book V. Columnae. As the title itself clearly says, the book deals with columns and above all with the three architectural styles: Doric, Ionic and Corinthian.
These three pages I have chosen, present three different situations in the book. In the first we see a text on the left combined with perspective drawings of the Corinthian style columnon the right. What interests me is the particular arrangement, which allows us to read the text (it could be a description of the column) and at the same time to observe the drawings. In my opinion this allows the reader to better understand and memorise what the writer wants to express. Also in the rest of the book we find several pages structured in a similar way and in my opinion it is a good choice, especially in architecture. The second one, on the other hand, presents only one drawing. This one is particular, as it is a very precise measurement of an ionic capital. What strikes me, besides the beauty of the drawing, is that even at that time they wanted to be very precise. Finally we have a drawing of what could be a triumphal arch. In the last twenty or so pages there are no texts, but a series of drawings in which the columns appear. This columns are represented in the whole of a building, to give an idea of how and where the columns are placed and also what importance is attached to them. I chose this one among the different drawings because it is probably the most decorated and complex building we see in the whole book. Note that the paper of my third choice is different from the one adopted in the rest of the book. In fact at the end of the book we find a collection of drawings physically separated from the rest of the book. It is therefore not clear if it was deliberately made by the author or if they are pages found and printed/copied on a different paper.