Memento

Nolan has said in interviews that he worked from a short story called "Memento Mori" by his brother Jonathan Nolan, and the finished film premiered in the United States on 4 May 2000, arriving in the wider world after screenings at major Film Festivals and a European festival run that included the Cannes Film Festival. It took home 3 awards at the 74th Academy Awards ceremony in 2002, and it later became a reference point for any talk of the Film vs movie question, since its structure is a film structure: it is designed to be watched, not merely discussed. The structural ideas it introduced were picked up by later directors, and in 2016 Denis Villeneuve's Arrival, with its folded, non-linear time, showed how far the experiment had travelled. That lineage matters, because Memento is not a puzzle box for its own sake; it is a psychological thriller that uses chronology as its instrument.

The structure: color backward, black and white forward

The film is built from 2 alternating sequences. The color scenes run backward through Leonard's recent past: each color scene ends where the next one begins, so the audience experiences Leonard's life the way his damaged memory experiences it, arriving at the start of each episode with no memory of how it got there. The black and white scenes run forward through his search for John G, the man he believes killed his wife, and they end with the opening of the color strand. The two directions meet in a single moment: the black and white strand's final frame is the color strand's first scene, and that is the scene most viewers misremember. The color strand contains roughly 24 minutes of the running time, and the black and white strand the remaining 70 or so minutes, though the exact split varies by cut and by how you count the bookends.

• Color strand: backward, from the end of the story toward the beginning
• Black and white strand: forward, from the beginning toward that same end
• Meeting point: the diner scene with Teddy and the Polaroid camera

What the color strand shows, in its true order

To read the color strand in true chronological order, start with the diner. There, Leonard is with Teddy, an agent who works for the insurance company that paid him after his wife's death. Teddy is carrying a Polaroid camera, and Leonard is being trained to photograph, describe, and dispose of evidence without hesitation. The sequence continues with Leonard visiting his brother Sammy, who lives in a care facility and suffers from the same anterograde amnesia that Leonard has; Sammy cannot form new memories and has constructed an elaborate false memory of his own wife to survive. The strand then reaches its darkest scene: Leonard, following Teddy's coaching, shoots a man at a gas station, photographs the body, and buries it in the woods. Teddy takes the Polaroid of the corpse and hands Leonard a new target: the man who killed his wife. Leonard is now a weapon with a purpose, and the color strand ends exactly where the movie begins, because the movie's first frame is this handover.

What the black and white strand shows, in order

The black and white strand is the search itself, and it is the strand that contains the film's central deception. Leonard checks into motels, interviews John G, and collects evidence in manila folders. The folders are numbered, and Leonard's system depends on them: folder A holds evidence of John G, and folders B, C, D and beyond hold the cases he has finished. The strand contains 2 scenes that change how the film is read. In the first, Leonard finds a note in his own handwriting: "You already did it." In the second, he photographs Teddy, looks at the print, and realizes that the man in the photo is himself, and that the tattooed name he has been hunting, "John G," is written on his own skin. He had already killed John G before the film's first scene. Everything after that is Leonard, knowing what he has done, rebuilding the hunt so that he can keep having a purpose.

• Folder A: open case, John G
• Folder B: the woman in the red shirt, a fabricated case
• Later folders: finished cases, kept so the system never stops

The ending, in the order the events really happened

The ending is a choice, not an accident, and the events in their true order run like this. First, Leonard's wife is killed and he is attacked, which damages his memory. Next, he begins the search and meets Teddy. Then he kills John G, discovers the truth about himself, and learns that Teddy is guiding him for reasons that include the insurance company's interest and Teddy's own agenda. Finally, Leonard decides to start a new hunt against a man he knows is not guilty, because a man without a purpose and without memory is nothing. The final shot is the one the movie opens with: Leonard sitting in a car, camera raised, waiting for a target. The film's last scene is its first scene, and that closure is the point.

Why the film uses this structure, and where it fits

The structure is the argument. By forcing the audience to arrive at each moment with no context, the film reproduces Leonard's condition and makes the viewer feel the loneliness of a man who must trust paper over memory. The black and white strand supplies the context that the color strand denies, so the two timelines together do the work that a normal plot does in one direction. Within the film movements of the 2000s, Memento sits beside other structural experiments, and its influence shows up in later work that folds time rather than merely reversing it. The 3 awards it won, the 2001 screenplay recognition, and its continued presence in festival programming all point to the same fact: it changed how audiences are expected to participate in a thriller, and it made the reversed chronology a tool other directors could pick up and use.