The Argentinian-born director Andy Muschietti, whose only other feature is the 2013 horror film Mama (which I have not seen, but now want to), demonstrates a flare for both horrific imagery (of the slow-building-dread variety and the sudden shock variety) and the mundanity of normal life; he and cinematographer Chung-hoon Chung, a regular collaborator of Chan-wook Park’s (Oldboy, Stoker) give the film a distinct visual sensibility that is both familiar and slightly uneasy.