> Imagine a textbook where all the diagrams were at the end of the chapter and you had to keep flicking between pages to refer to them. You have to imagine that as it doesn't exist, for some reason.

I don't know if you are joking, but this was not uncommon for quite some time. It used to be that color printing was much more expensive than black and white. Text books often only had a few pages with illustrations and images in color. The color printed sheets were added last so they ended up exactly in the middle of the book.