Once upon a time, Tom Cruise and Nicole Kidman were supposed to be Jewish. Bill and Alice Harford, the decidedly gentile married couple that the actors portrayed in 1999’s Eyes Wide Shut, are about as kosher as a bacon milkshake. But when Stanley Kubrick first conceived of adapting Arthur Schnitzler’s 1926 novella Traumnovelle in the Seventies, the filmmaker allegedly envisioned the male lead as Woody Allen, a man so Jewish that Shabbat practically observes him. Kubrick’s initial casting idea, which is all but inconceivable to anyone who’s seen the finished film, had been prompted by fidelity to its Freudian-to-a-fault source material. At some point during the intervening decades between Kubrick’s decision to bring the Schnitzler story to the screen and the first day of production, he had a change of heart. According to Kubrick’s credited co-writer, Frederic Raphael, the director eventually insisted that his protagonists be made “vanilla” Americans so as to establish a more perfect sense of normalcy for his smirking erotic psychodrama to defile. He wanted these characters to be privileged above all prejudice, capable of walking into any room as though they belonged there. And when Stanley Kubrick made a decision, there were no half-measures. On the contrary, he took things to the other extreme, turning Bill and Alice Harford into the Mitt and Ann Romney of the Upper West Side, planting a Christmas tree in nearly every scene, and – in much the same way as he had previously used candlelight to create the chiaroscuro world of Barry Lyndon – flooding the film’s interiors with the opioid haze of holiday lights so that every room feels tongue-kissed by temptation. This may seem like a minor cosmetic change, a quirk of casting stars capable of financing the movie, but its profound effect on the story can’t be overstated. As Kubrick’s swan song finds itself becoming an unlikely seasonal favourite – daily December showings at Manhattan’s IFC Centre have performed so well that the theatre plans to make them an annual event – it’s becoming increasingly clear that Eyes Wide Shut isn’t a perennial Christmas movie because it’s a masterpiece. It’s a masterpiece because it’s a Christmas movie. Released at the height of summer, the film arrived in the straitjacket of its own bizarre context, and it would take years before what happens in the movie began to seem more relevant than what happened behind the scenes. First, however, Eyes Wide Shut was simply that pornographic vanity project for which Hollywood’s most glamorous power couple had been held hostage for more than 400 shooting days. Completed less than 100 hours before Kubrick’s sudden death, the film was also burdened by the pressure of being either the varnish on a perfect filmography or its only blemish.And as if that weren’t enough, the movie’s pleasures were further – and quite literally – obscured by the CGI silhouettes that had to be layered over the infamous orgy scene in order to appease the MPAA. That last twist of the knife was particularly ironic, as Eyes Wide Shut is nothing if not a story about the need to discern the difference between reality and the various tricks we use to disguise it. This is a Christmas movie made by someone who was used to seeing the holiday through the living room windows of other families, curious if the festivity was anything more than a performance for the people watching on the sidewalk outside. There are couples that appear perfect, and then there are the Harfords, who might as well be the figurines glued to the bottom of a snow globe. He’s a doctor with a seductive bedside manner and a toothy grin that betrays a lifetime of smooth affluence – the youngest man in the old boys’ club. She’s a recently unemployed gallery manager whose body the camera lavishes with more male attention than her husband has in years. Their relationship is a lot like the massive Christmas tree that’s been hunched into their living room: gorgeously ornamented and completely severed from its roots. When first we meet them, they’re readying themselves for the glimmering holiday party where Alice is shamelessly hit on by a cartoon Casanova who’s equal parts European royalty and cheeseball male escort. When she informs the mysterious stranger that she’s married, he parries with a practiced response: “Don’t you think that one of the charms of marriage is that it makes deception a necessity for both parties?” When she later tells her husband about the man, he replies that the stranger’s desire was “understandable.” Wrong answer. Haunted by the Ghost of Carnal Knowledge Past, Bill steals into the New York night, spirited into a dream world populated exclusively by the specters of sexual temptation. Like Ebenezer Scrooge and George Bailey before him, he’s led on a whirlwind tour of things he would never have seen for himself, pinballing from one erotic near disaster to the next. But Bill isn’t looking to get off so much as he’s looking to weigh the value of what he desires against that of whatever it is he and his wife have lost. He never even manages to take off his clothes – at best, he trades one costume for another, exchanging the medical license he flashes to everyone he meets for the mask he needs to crash a costumed swingers party.It’s precisely this futility that makes Eyes Wide Shut such an essential Christmas movie, however, and makes the holiday so vital to Eyes Wide Shut. Bill Harford isn’t trying to get away from his wife – he’s trying to get back to her. Christmas at the movies isn’t the same thing as Christmas at mass. On screen, the holiday isn’t a religious event so much as a shared shorthand for a certain frame of mind. The films that we’ve now come to most closely associate with the holiday have one thing in common, and it’s not a reverence for the miraculous arrival of baby Jesus. The films that truly belong to this subgenre – the ones that incorporate the season in context of its broader emotional resonance – share a warm preoccupation with the feeling of return, of reclaiming something that the protagonist is afraid to lose or fears already lost. Theologically, Christmas is about birth; culturally, it’s about rebirth. Bill Harford’s dark night of the soul might appear to have more in common with The Odyssey than It’s a Wonderful Life, but with each opportunity the journey gives him to throw his marriage away – and with each temptation he miraculously avoids at the last second – he finds himself that much closer to home. For Bill, every offering of sexual bliss is ultimately a perverse step back to his wife.Retracing his steps in the cold light of the following day, Bill is gobsmacked by the many-faced Ghost of Sex Narrowly Avoided. The sweet prostitute he almost had sex with is revealed to be H.I.V. positive; the orgy house – once an enchanted kingdom of embarrassed pleasures – has been stripped of its magic, its consequences shown to him on a city morgue’s slab. By the time he finds the Creepy-Fuck-Party mask he wore to the previous evening’s shindig on the pillow next to his sleeping wife, the doctor can’t help but be overwhelmed by the reality of how far he’d gone, and how much further he had to go to make the journey home. Finally, Bill and Alice can wake up from their own dreams and begin to restore the one they shared together. Like many of the best Christmas movies, Eyes Wide Shut could theoretically take place during another time of year. The holiday party, for example, could have been timed to any other occasion without dramatically altering the plot. Likewise, Bill and Alice could have gone somewhere else for the final scene, in which they stroll through a lavish toy store while reckoning with the state of their marriage. But they didn’t. And it’s there, in the counterfeit FAO Schwarz, that the film becomes a perfect inversion of yet another classic Christmas story: William Sydney Porter’s The Gift of the Magi.In Porter’s fable, a poor married couple secretly sells the things dearest to them – her looks, his legacy – in order to afford each other presents that they ultimately can’t use. After a long night of weighing his wife’s value against that of a half-dozen different women, Bill realizes something that his wife has long since figured out for herself: Christmas isn’t about giving, it’s about getting something back. And Alice, tentatively satisfied with her husband’s efforts to return to her, ends the movie by suggesting that the two of them do the one thing guaranteed to return them both to their wedding night, when everything was new and the future was full of hope.