Moviemaking magic is part art and part science, and most of us don’t fully know how the cinematic sausage gets made. Many people enjoy watching “behind the scenes” and “making of” videos to get a glimpse of what we don’t see on camera, but even those don’t give us all the ins and outs of how filmmakers create a great movie experience.

Perhaps that’s why a video from a woman showing her screenwriter husband geeking out over a very specific element of filmmaking has gone viral. Or, maybe it’s because we all love to see people passionately explain something they know about. Either way, his explanation of how staircases are purposefully used to drive the plot and reveal information about characters in movies has people engrossed.

The lesson that started it all

In the video, the couple is watching The Princess Diaries 2 when the husband pauses the movie and asks his wife, “Have I told you about staircases in film and what they represent in film?” She giggles (clearly this is not an unusual occurrence) and says, “No.” He puts down the remote, apparently so he can use both of his hands to talk, and starts in on the lesson.

“A staircase, almost every time in film, is used........

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