Yeah that's the one. A very good blind buy too. Yeah the water at the beginning reminded of birth, well pre-birth even, but at the same time gave me a premonition of death, so covers the whole spectrum you could say. That sequence had something of the quality of a Brakhage or handpainted short about it, but already carrying greater depth of meaning. And by the end of the film there were hints in its architectural space of Antonioni, with Bergman's Cries + Whispers, The Shining, Mulholland Dr, Jacques Rivette in between. As i said, her sense of composition, use of deep space, the whole frame, is exceptional but not in a showy way. The camera is often static but when it moves it's impressive. I'm worried about any critics who might get hot under the collar about exploitation or sensuality involving children. Childhood IS sensual. 

I too like its slow development + ambiguity, 20 minutes till we have an adult figure and we are mainly restricted to 2 classes + their teachers. The similarity with Suspiria is quite strong, with the malaise and the shadowy headteacher figure, but it doesn't lay it on thick like Argento. It's also very beautiful. And, even more impressive cos she didn't attend one herself, she catches the edgy prison-like claustrophobia of boarding school, the elitism, the urge to escape, alongside a pantheistic exploration of nature and freedom; the freedom of nature, the nature of freedom.