There are boxes you can see. You can crawl in them, and you can get out again. This is different with invisible boxes. Are you usually the toughest kid in the class? Then it is difficult to say that sometimes you are also afraid, or sad. Or are you the smallest kid and everyone thinks you're so cute? Then you are never the boss of all the games, although you might be very good at it. It would be nice if those invisible boxes didn't exist. Then nobody would think it's crazy if you do wild things in the morning, and you suddenly want to be a beautiful princess in the afternoon.