I read a lot of Ben's code while I was working on the IDE for Arduino. It was always extremely clear, robust, and well-commented. And occasionally hilarious. My favorite part was the prompt to take a walk that showed up when you had created a new sketch for each letter of the alphabet on a particular day (sketch names defaulted to something like 20231003a, 20231003b, etc). But there were also some good digs at the failings of Processing's various dependencies, like Java and Mac OS.
The world of computational design and open-source software is much better for having Ben Fry and Processing in it.