But 1570 is old technology; most cinemas shifted to digital around a decade ago, which means there are now only 41 cinemas in the whole world capable of projecting the format. These include the Imax in Melbourne, Australia, which removed its film projector in 2015 but bought it back two years later when Nolan appealed to Imax cinemas around the world to show his 2017 film Dunkirk on 1570.

Now, ahead of The Odyssey’s release this week, Nolan fans are heading down under from places as far flung as Turkey, Singapore, Malaysia, Germany and Los Angeles to watch the film at Imax Melbourne, which is the only cinema in the southern hemisphere with a 1570 reel of The Odyssey. The enormous reel runs more than 17km, weighs 240kg, and is, as Imax Melbourne’s technical manager Dan Drobik says, “a precious commodity”.

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Melbourne’s Imax is also the largest 1.43:1 cinema screen in the world, measuring 32m wide by 23m high (roughly as tall as a seven storey building). When tickets for The Odyssey first went on sale – a year ago – it sold more than 17,000 tickets in under 24 hours. They have since sold more than 30,000 tickets; The Odyssey is already their eighth biggest film of all time, before it has even opened.

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