There are techniques at hand here that would put to shame the documentary style that is used today. When her son runs up and out of frame and up leaps a grown man, she would see that coming, but the angle doesn't allow the viewer to, and that's what matters. Overall it is an unsettling film and deserves credit for it.
Average, average, average, this is pretty boring and only a little spoo-- HOLY FUCK, DID THAT KID JUST TURN INTO A GROWN ASS MAN? THAT WAS NOT A SPECIAL EFFECT! WHAT THE FUCK? Average, average, end.
One more of those "Demon/Possessed/Evil Children" films of the '70's, but this one differentiates itself by adding a (welcome) Oedipal undercurrent that makes the proceedings as seedy as they should be. Unfortunately the explanation of everything is ridiculous and no one acts very logically, but there's some good scares in places.
I'd watch anything starring Daria Nicolodi, and this actually had a surprisingly decent plot for 70s italian horror, and a few standout shots, but overall the motif of "inanimate objects moving around ominously" is quite hokey and the film loses a lot of tension by wasting time with this. It's worth it for die-hard Nicolodi fans like myself, probably skippable for anyone else.