if you want to get a feel for how the book will read, the author has written a handful of illustrated blog posts in a similar style:

http://adit.io/posts/2016-03-13-Logistic-Regression.html

http://adit.io/posts/2016-02-20-Linear-Regression-in-Picture...

http://adit.io/posts/2013-07-22-lenses-in-pictures.html

http://adit.io/posts/2013-05-15-Locks,-Actors,-And-STM-In-Pi...