For TWOLD, I stumbled on a fresh take on ghosts.
Instead of ghosts being dead spirits, ghosts are manifestations of people’s idolatry and internal bondage.
Ghosts appear when people allow sins like bitterness or covetousness to fester and grow until they take on a life of their own.
A person is haunted by ghosts of that person’s creation.
I’m exploring the possibility of applying this mechanic to haunted houses. Design - Reinventing the haunted house.