How does Tock help get everyone down from the Castle-in-the-Air?

If you were going to exile someone, where would you send them? Exile means to punish someone by sending them away from their home country and not allowing them to return. In Norton Juster's The Phantom Tollbooth, Milo visits a faraway land. While there, he learns that many of the land's problems began when the princesses Rhyme and Reason were exiled.