The study of invisible writings was a new discipline… [the mathematics are] complex, but boil down to the fact that all books, everywhere, affect all other books. This is obvious: books inspire other books written in the future, and cite books written in the past. But the General Theory of L-Space suggests that, in that case, the contents of books as yet unwritten can be deduced from books now in existence.

– Terry Pratchett, Lords and Ladies

I’d say Pratchett has nailed it again, yes?