Damn. Polanski's
Repulsion has got me all shook up. It might be my favorite of his films that I've seen, and easily one of the most unsettling horror films I've ever seen.
It reminded me a bit of
The Haunting, another fantastically scary (and stunningly shot) psychological horror film from the 60's. Also, it's clear Darren Arronofsky is really, considering its influence can be felt all over a bunch of his movies.
The gradual descent into madness is realized so, so, well. There are all sorts of visual ques, from the mundane (strangely unsettling close ups on ordinary objects) to the macabre like the disgusting rotting rabbit that decays as the film goes on. It just makes you feel all itchy and uncomfortable as you are immersed into the perspective of the fractured protagonist.
The sound design is also notable in that in any given scene it feels like there are only a few distinct sound sources. Typically the sound of breathing or walking, and then a repetitive noise in the background, such as the barking of dogs, a bell ringing, or a slowly dripping faucet. The quiet punctuated by those sharp sounds, like the incredible visuals, help immerse you into the horrifying reality Carol lives in.
While there are a number of jump scares in the film, they are exceptionally effective. The reason they work so well is both that the film its maddeningly patient in building up to them, and the payoffs are genuinely terrifying. But, as a cruelly effective psychological horror film, the jump scares are not where the true fear lies. It's in the deathly stillness, the cracks in the walls and family photographs, in the shadows and behind closed doors.