Thats too dangerous! The pencil could snap then one piece could hit your eye then you run around your house screaming then you fall down the stairs then roll out of the door and get hit by and SUV that Chuck Norris is driving then he gets mad at you and roundhouse kicks you in to the moon where you try to draw then everything in this post happens again but on the moon.
That's too dangerous!! You could cover the entire Solar System with a giant glass dome where we all go psycho and stuff (No, I didn't get that from the Simpson's movie)