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As I've heard many times about the notorious director's work, however, it is style over substance. Argento seems to understand the aesthetics of horror very well, but since he doesn't provide us with any comprehension of the unfolding events, we are left with what is, at its best moments, a really great-looking music video. Without knowing at least a little bit about what's going on, it is difficult to invest in anything beyond what is presented on the surface. Once we do become clued in, the events, to an extent, mirror the third act of Rosemary's Baby. Thankfully, the closing slice is a great payoff for the patient, as it is equal to if not better than the opening.
Overall it's well worth the watch though while exemplifying some of the tastiest aesthetics the horror world has to offer, writers won't be taking cues from it any time soon.