Maybe, suggests the defeated interviewer, "Inland Empire" should be approached like James Joyce's "Finnegans Wake": Accessible as lyrical art, but filled with puzzles for those wanting to go deeper. Lynch nods, swigging one of his tepid cappuccinos. "Yes, with James Joyce, word combinations conjure things. He uses them as an art form and a language for abstractions. Cinema is its own language. As the sound and picture get going and things begin to happen, it can get pretty abstract, but it's a language that says something that can't be said in words -- or maybe could, by a poet."

"I like films that hold abstractions," he says. " 'Getting it' is a subjective thing, because we're all different, and each interpretation is as valid as another. The audience is putting things together as they go. If there's a bump in the intellectual understanding, let it happen. Have that experience, and then later mull things over. Let intuition kick in. It's a higher knowingness. If you try to put it into concrete terms, you're gonna block it."

They are simply lovers who experience a passing connection. Their search for something deeper (which eventually takes them on an ayahuasca trip overseen by a shaman played by an unrecognisable Lesley Manville) is thwarted by what the director calls the “asynchronous” nature of their dynamic.

How loud was the conversation back then over authentic casting? “It was never even discussed,” Craig says, looking askance. Guadagnino is equally dismissive: “Sexuality is not one thing. Is it five things, is it seven? There is no such thing as ‘the gay’.” Craig has another thought: “Sexuality is a very modern idea,” he says. “People’s sexuality, or whatever they desire, is as individual as a fingerprint.”

Does sharing a vocation reduce the chances of being asynchronous? “No, it enhances them because film-makers are radical narcissists who just want to do their own thing. It’s a disaster.”

Guadagnino goes into splutter mode again. “I would never put myself on the same shelf as Daniel. Come on, he’s an icon! I’m a grey, balding Italian-Algerian director who’s made some movies. I’m boring.” Craig leans forward: “So am I. Let’s say I wasn’t famous, and I was a free agent. It either happens or it doesn’t happen. Those moments are magic. I think of moments like that from my life and, my God, they’re electrifying. Whereas if you’re out on the prowl, that’s really sad. And look, Lee sort of was on the prowl. But he wasn’t looking for what he found with Allerton. That’s what I’m interested in capturing as an artist. The moment where you go, ‘Oh fuck!’”

What’s your relationship now to the work back then? Are you as passionate? I really had to think about that. My analysis of that is, you’re a different person with different needs. A lot of that is based on confidence. When you’re starting out in an art form or anything in life, you can’t have confidence because you don’t have experience, and you can only get confidence through experience. But you have to be pretty confident to make a film. So the only way you counterbalance that lack of experience and confidence is absolute passion, fanatical spirit. And I’ve had this conversation over the years with filmmaker friends: Am I as passionate as I was in my 20s? Would I risk my whole life? If it was my best friend or my negative drowning, which do I save? The 20-something self goes, I’m saving my film! Now it’s not that answer. I’m not ashamed to say that, because all that passion doesn’t go away. It disperses a little healthfully. I’m passionate about more things in the world. I care about more things, and that serves me. The most fascinating relationship we all have is to ourselves at different times in our lives. You look back, and it’s like, I’m not as passionate as I was at 25. Thank God. That person was very insecure, very unkind. You’re better than that now. Hopefully.

Guadagnino brought them Challengers, which will be released this month. Reznor said, “He started us down a path, saying, ‘What if it was very loud techno music through the whole film?’ ” (This is exactly what it turned out to be.)“I wish I had his notes,” Ross said of Guadagnino. “His notes were so fucking funny on what each piece was meant to do.”“Oh, yeah,” Reznor said. “ ‘Unending homoerotic desire.’ It was all a variation on those three words.”

Film geeks don't have a whole lot of tangible things to show for their passion and commitment to film. They just watch movies all the time. What they do have to show is a high regard for their own opinion. They've learned to break down a movie. They understand what they like and don't like about a film. And they feel that they're right. It's not open to discussion. When I got involved in the movie industry I was shocked at how little faith or trust people have in their own opinions. They read a script and they like it - then they hand it to three of their friends to see what they think about it. I couldn't believe it. There's an old expression that goes something like, He with the most point of view wins.

When kids are growing up, their moral compass isn’t formed yet. So there’s a dark side to it where you’re not really allowed to make mistakes. You’re supposed to make mistakes growing up and then learn from them. It changes who you are and helps you become a better person. But now, through everything being recorded, your mistakes can be immortalized for people to see, and kids aren’t allowed to make mistakes because that stuff can be brought up to tear them down later. So it’s a strange world that we’re living in now, and we won’t really know the effects of it till down the line.

I’d be in front of camera, and Danny would be behind. Danny would do a rough cut, I’d do a final cut, and then I’d do sound effects and music. And Danny would focus on VFX and color. So, during the process, we were more involved with those departments. I did a lot more with the sound and the music, and Danny did a lot more with the color. But on set, Danny would be the main voice communicating. If I had something like a direction that differed from what he was saying, I’d speak with him first and then we’d do a take like that. It was good having two of us, especially with scenes that had a lot more people. Danny could focus on the main, and I could look at the peripheral stuff. I feel like having a co-director is a bit of a cheat code. I can’t imagine doing it all by myself.