The wood from a tree is designed and crafted as a door.
Who knows the wisdom carried by the tree? What happens to that knowledge when it is felled and used by humans?
A errant guest acts out of turn and is shown the front door.
That door closes, shutting out the energy of chaos, trauma and incoherent thoughts.
But the door will open many more times, as the dweller seeks for suitable recharging of the spirits.