[nohaydeprobleme]

Though I'm not the same commenter, I did read the book. The book has diagrams, though they are more like sketches you might see on a chalkboard or whiteboard in a lecture (e.g. a ray diagram, several rows of hand-drawn circles that are slightly uneven non-uniform sketches, and other geometric sketches, such as triangles inside of semicircles).

There are some nice abstract artistic illustrations at the start of each "part" of the book (and also the covers), though they are more for aesthetic decorations rather than for communicating mathematical concepts. For example, one of the illustrations is an abstract medieval-like artwork with a sun that has a human-like face, a starry sky, and a person in robes whose head is peeking through the starry sky to look at a world across the boundary. So, you won't lose out on comprehension at all by reading the ebook, but the book does have some minor artwork only tangentially related to the book's content, which might make a physical edition preferable for aesthetic/collector's purposes.

The e-version is perfectly fine, though; as the prologue states, the book was first published as part of an online column on the Mathematical Association of America's website, so the e-version appears close to the original version. The prologue writer who helped publish the book also first received the essay as a 25-page printout from an audience member at a lecture.