When buying (reference) books was still 'really' a thing, I always liked reading the colophon in O'Reilly published works to explain the animals, typeface(s), process used in their creation.

Particularly the Ritchie and Kernighan books where they dog-fooded roff etc.

If you're wondering why every other image seems to use red for highlights, it's typography tradition: https://www.gwern.net/Red