This is a book whose pages contain no written, drawn, painted or printed signs what does not mean the pages are empty and dumb. There are only very few words in this book, much less than in this description and they are placed where usually nobody places any text since this part of a book is impenetrable for reader's eyesight. However it is not in this very case.
The idea of such a book came to my mind several years ago when I was rambling around a little old town and peeping the busy market square through the slits of narrow streets.