Do you carry books with you when you’re out and about in the world?
And, do you ever try to hide the covers?
Nowadays I rarely carry books with me except to and from the library. And during the actual carrying, they usually do stay hidden in a bag... But not with emphasis on "hidden" - just because it would be uncomfortable to carry a pile of loose books!
Back in the days before mp3-players and mobile phones - when I still also travelled more - I would bring a book for example on a train journey. I probably wouldn't choose one I'd feel a need to hide, though!
I guess the classic example would be hiding a novel in a school book or something. If I ever did that I've managed to forget by now!