In the beginning writing is easy. You see a wide expanse of white in front of you and you scrawl or tap away at it until you see a comforting amount of lines. After a while though, you reach the point  where you get stuck and you reread what you've written and you get the sudden urge to either lean on backspace or crumple up the paper and throw it behind your back with a satisfactory pffmff. That's one reason why I prefer paper and pen. You don't get that sound on a computer. Besides, it is a lot more fullfilling to see a trashcan full of paper (or a room-full, depeneding on my attitude) than a big blank white  screen leering at you and mocking your eyes out until they begin to water.