A keyhole could feel like more than an opening
A keyhole is a small gap between a private room and the world beyond it. For people who believed unseen forces could listen through such openings, that gap offered a possible route for attention to enter—even when no person was standing outside the door. The concern turned an ordinary feature of a lock into a spiritual vulnerability.
Wax made protection tangible
Pressing wax into the hole gave that concern a physical answer: close the passage, and symbolically deny anything on the other side access. The gesture resembled sealing a letter or container, where wax marks a boundary that should not be crossed unnoticed. Its force lay in the act of protection, not in proof that a supernatural listener was present.
That small plug made an invisible fear manageable. Instead of confronting an unseen presence directly, a person could perform a simple, deliberate act at the door—leaving the keyhole visibly sealed.
