Vesuvius — the very name sounds ancient, rhythmically mythical, so tied into tales of a destroyed past that one almost forgets it’s still very much in the ordinary, existing present. The legendary cone doesn’t exactly loom large in Gianfranco Rosi ‘s “ Below the Clouds ,” a wandering, granular documentary study of its surrounding landscape and population. Instead, it’s auspiciously backgrounded, a calm but threatening variable factored into modern Neapolitan life, nearly two thousand years after it vanquished Pompeii. For some, that drastic legacy amounts to a busy, investigative livelihood, for others it feeds into everyday environmental anxieties, while for others still, it truly is ancient history. There are many ways to live around an active volcano, and this humming, keen-eyed fil

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