the blip is only a symbol that shows you that you are reading with your unconscious. therefore, you can also pr without the blip by diverging and looking beyond the text, noticing the white text ,doing the X method etc.
pr has been demonstrated on computer terminals and it seemed to work just fine on my pda. i dont think that our mind is limited to a piece of paper, so to sum it up you can pr from any piece which you would be able to read normally (correct me if im wrong ofcourse).