Do you commonly carry those around with you? I'm not mistaking a resturant for a library, i just want to kill time until my food comes out.

Is there a reason why someone sitting by themselves reading a book on the e-reader app on their phone is more offensive than someone sitting by themselves reading a dead tree book?

Or just do what we did before, sit and think. What they call "mindfulness" now and even meditation is what we used to call just being alive.