In addition to the commentary of 26 calligraphers (artists) including Kakishita and Sato, various thoughts on "contemporary calligraphy" and "art of calligraphy", the history of modern calligraphy, issues, etc. are also written. It is a good book that you can know very much in one book.
The selection of calligraphers (artists) is also excellent, and various types of calligraphers of various ages have been selected (although there are many great calligraphers). It is a microcosm of the world from which you can get the whole picture.
There are various genres in calligraphy and it is difficult to understand unless you are familiar with it, but if you compare it to music, there are rock, techno, hip hop, ambient, etc., and artists of each genre (except pops) are introduced It may be easier to understand that it is one book.
This book is also highly recommended for those who think "I'm not sure about calligraphy works but I'm interested".