We could have had a major disaster on our hands. I've heard of children getting ahold of their parents' sharpies, crayons, eyeliner, and many other very permanent materials and making a horrible mess on the walls.
I know there is a very good chance that will happen to us someday.
Luckily for us, his "drawing on the wall" was only done with a Magna Doodle Pen. Whew! For now, we'll keep our sharpies, eyeliners, pens, and any other drawing devices safely out of Nate's reach.
Next time, we might not be so lucky.