they are everywhere...
It's text; it's something I see. I had always assumed everyone was like this, except for those people whose lips move while they're reading, for some reason.
There are quite a lot of those running about. Maybe if you looked up from the books you'd see they were everywhere....
I'll leave now before you have your 'close of Body Snatcher' moment - here comes Donald Sutherland and he's pointing at you...