By looking a bit more closely to the book , Synopsis architecturae civilis eclecticae, this three spreads caugth my eye.

These first two pages (p.100, 101) caught my eye, firstly because of the small picture on the left, which shows that the first continuation is over (the book has in total four continuations) and secondly because of the page on the right, which looks like the title page.

I noticed the next two pages (p. 106, 107) because of the mathematical problem on the left and the construction drawing on the right site.

I noticed the last two pages (p. 141, 142) because of the nice interior perspective on the left and the empty page on the right site. This empty page is not rare. After every drawing or picture in this book always follows an empty page. This is probably for taking notes.