"Without books the development of civilization would have been impossible. They are the engines of change, windows on the world, "Lighthouses" as the poet said "erected in the sea of time." They are companions, teachers,magicians, bankers of the treasures
of the mind, Books are humanity in print."
It might have been a temporary thing where your web browser couldn't load the image for whatever reason. That happens to me sometimes. What I usually do is right-click where the image is supposed to be and then choose "show picture" or "show image" or whatever is appropriate for the browser you use.