The Appeal of the Forbidden Secret:
In his book The Writer's Journey, author Christopher Vogler talks about the Law of the Secret Door (p. 112-113) (also related to Carl Jung's "Forbidden Door"). Many myths include a set-up whereby the heroine is told she must never eat from a certain tree, never open a certain box, or never pass through a certain door, upon pain of death. Of course the myths I’m referring to are Eve in the Garden of Eden, Pandora with her box, and Belle in Beauty and the Beast. We all know what happens, what is sure to happen anytime this sort of situation presents itself in a story. If you have children, you probably have this happen quite regularly in your life as well.
The power of curiosity is universal. In the words of the immortal Dumbledore, "Curiosity is not a sin.... But we should exercise caution with our curiosity... yes, indeed" (p. 598, GoF). Whereas later in the series Harry more strongly develops his own driving need to set the world right by stopping Voldemort, in the first three books, curiosity is one of the prime motivators driving on Harry, Ron, and Hermione.
Threshold Guardians Challenge the Seeker:
To further drive home the dangerous and important nature of these portals to new worlds or gateways to new challenges, Threshold Guardians are before them to keep the unworthy out. A guardian may be a goodhearted ally of the hero, looking out for his best interest, or he may be an accomplice of the villain, seeking to harm or hinder the hero from completing his quest. Either way, as part of his quest, the hero will be tested by his ability to overcome or win over the many Threshold Guardians he will encounter along the way.
At Platform 9 3/4, it is the guard who, with Muggle ignorance of the wizarding world and his belief that Harry is pranking him, keeps Harry from, initially, finding the hidden door. Harry must not give up, he has to listen for clues and approach the odd family that will provide him entry...the Weasleys.


