Opus Book Test
This gem of technology, it's an INTELLIGENT MARKER that will allow you to perform miracles.
Imagine the following:
You are presenting two books to the public.
A dictionary of more than 1100 pages (For each language, the number of pages may differ from country to country).
A novel of about 300 pages.
The viewer chooses a book. You ask him to open this book to any page and give you the page number.