LEFT : 220 ISO F4/0 1/25s
I wanted to focus on the subject with his cellphone so I chose the smallest F stop.
RIGHT: 250 f4/0 1/25s
I wanted to have the book to stand out among the other books with a shallow depth of field so I used the smallest f stop.
these images are meant to illustrate that cellphones has replaced the books and especially the references book such as Britannica and encyclopedia and have transformed into Wikipedia. And in the left image we can see that the shelves are empty and instead we see a person with a cellphone in his hands.