Magical beings who have their silver cords tethered to the Axis Mundi. In case it gets really windy. That way they just kind of look like kites, they don't end up flying all over the place like when a little kid loses a helium balloon outside a shopping mall. Because that would suck. If you were a magical being and there was this little kid standing in a parking lot crying, and his mom was saying, "Don't cry. I'll get you another helium balloon/magical being." Really, when you lose a balloon, all you can do is just wave good-bye to it. You can't try and get it back, unless you had a helicopter, but even then it would probably get sucked into the rotars and pop.