Also depends on the rules of the universe. In the Dresden files, for example, places have a defensive aura based on stuff like… homeyness. A house that has been in the family for generations and people have lived there constantly will have a stronger repulsive aura for the fae. Whereas an apartment where a bachelor lives will have a weaker one.
Also stuff can still enter, it’s just that they get considerably weaker or completely powerless if they enter without an invitation.
Also depends on the rules of the universe. In the Dresden files, for example, places have a defensive aura based on stuff like… homeyness. A house that has been in the family for generations and people have lived there constantly will have a stronger repulsive aura for the fae. Whereas an apartment where a bachelor lives will have a weaker one.
Also stuff can still enter, it’s just that they get considerably weaker or completely powerless if they enter without an invitation.
I also like the Adventure Time interpretation, wherein a vampire will not enter without permission because he views doing so as impolite.