Horror film in which "monsters" not explicit...
 

I'm teaching the Cortazar short story "House Taken Over" in summer school, and I want to show a movie that is somehow related to it. The story has a fantastical element - there is something that takes over the house where the protagonists live, but that something or somebody is never seen or explained. Is there a good, or good enough, horror movie that has a similar theme? Even if the "monster" was revealed eventually, is there a movie where for long periods of time, the monster was left up to the imagination? And will I get fired for showing it to high school kids? Thanks for the help.

the haunting ...

(ghost - not monster)

but you never see it .. just hear it

some val lewton or jacques tournier

You see next to nothing in the original Amityville Horror. And if you're in Canada, it's leagal toshow to high school:)

Wow - that was fast. Thanks for the suggestions.

my bad, should be tourneur

controversial pick: Blair Witch Project. It seems to either be popular or hated, varying from day to day, but you never see the Blair Witch. Just rocks...

The Entity.

cool i knew that my name would come up sooner or later!!!!! :D

you do see it's 'handy-work' :)