This is interesting integration – because in Google Books, the words are not text and can not be copied – but somehow the organic SERPs are able to intepret them.

Which could mean that entire books may actually be in Google's Databases as text – but filtered as a image-like file for the book search excerpts

google.com/search?hl=en&q= ...

books.google.com/books?id=eKRy ...