Enemy of any parent of any small child anywhere.
You discovered them during the first week. I now keep the door of whatever room we are in closed, lest you wander out and I find you halfway up...finding you on the third step was heart-attack-inducing enough, thank you Teddy.
In saying that, under supervision, you are extremely adept at getting to the top by yourself (incredibly fast). A neat little game, whenever we need to get from one floor to another. And sometimes just for fun!