Growing up people probably played peek a boo with you when you were little. Chances are that you were so young that you don't even remember playing the game. But as you got older and began to be around young kids you probably were on the other end of the game and you were the one that was hiding behind your face behind something and then popping out and surprising a little kid. Peek a boo can provide entertainment and laughter for hours at a time. As you know the game is simple and can be played pretty much anywhere but why does this work? After reading I found the answer, it has to do with the concept of object permanence. Object permanence is an idea that little kids lack, it is the concept that an object is present even when it is hiding behind another object. When little kids see something that is covered by something they do not realize that it is still there they believe that it has disappeared. What this means for little kids is that when you are playing peek a boo when you hide your face behind something to them it is like your face has vanished. When you uncover your face it's a shock to them. To little kids it seems as though your face has appeared out of nowhere. Even adults would be entertained by this however as we get older we develop our object permanence and we realize that even when a person's face is covered that it is still behind the object that is covering it.