I liked the idea to fit the book into a predefined small number of pages - limitation drives creativity! Clojure source code is several times smaller than other JVM languages (like Scala, Kotlin, JRuby) and the book should be significantly smaller. Let it be 42 pages about Clojure. Sadly I do not have plenty of time, but always dream to write a book.
Another constraint is gonna be a picture or diagram on every odd page!
This book is free. If you want - you can donate 5 dollars.
I wish myself good luck and patients