Yet another of Carter's personalities, Josh, has regressed to boyhood. He's a terrified child, one constantly fearing the wrath of his father. Again -- not entirely unlike Carter -- Josh is an image of masculinity reverted to a "harmless" or impotent stage, pre-adolescent, and therefore pre-sexual.

Finally, the guardian of the children is the personality named Margo. Importantly, Margo is female. Margo rescues Amy, destroys the Elder Dr. Nix, and restores order. It is a woman, therefore, who finally usurps the role of "hero"/"conqueror" in modern America. Carter can only become a hero when he is...female. The film's valedictory shot is of a looming, powerful Margo, standing heroically behind his family (Jenny and Amy). Carter could only be himself (a caring individual and care-giver) when in the personality and guise of a woman...and the last shot explains this visually. Margo is not menacing; not evil. She is triumphant.

All throughout this masterful, unbroken shot, Waldheim explains the history of the Nix family and the theories underlying multiple personality disorders. She basically describes the events of the movie (Cain vs. Carter) in a fashion that makes sense out of perspective we've witnessed thus far. It's a journey from the top of Carter's mind, literally, to the bottom...to Cain's mind, where we spy his murderous handiwork (the corpse).

De Palma understands that form must echo content, and so the form of his film -- multiple perspectives coming together -- reflects the flotsam and jetsam Carter's splintered mind. The virtuoso unbroken shot is Waldheim's tour of that mind, a narrative maze of twists and turns, of science and ultimately death. But importantly, this tour is an unbroken one (like Waldheim's dissertation), making linear sense of the tale for the viewer.

A: I've always loved that song and I was always disappointed by how Paul Schrader used it in the movie. He didn't really use it; he threw it in over the closing credits. I remember working at the Video Archives at the time and thinking "If I had a song like that for my movie, I'd build a 20-minute scene around it!" So I guess I did.

Q: There's a really cool sense of dislocation when that song comes on, which still sounds so modern, yet we're in World War II France. It's one of my favorite sequences in the film. It reminded me of Brian De Palma, back when he was still good.

A: When I got the idea to use it, one of the things I liked is that the song was once removed and you already knew it from something else, as opposed to something that was written for the movie. You're listening to the lyrics of the song and you're watching Shoshanna [a character in the film played by Melanie Laurent] doing all this stuff, and you sit there thinking "Wow, this song was written for Cat People, but it's totally appropriate for Shoshanna's story!" It plays like an interior monologue for her.

In that film, the famous "Odessa Steps" sequence dramatized a massacre conducted by the Tsarist Regime, set atop a wide staircase. Civilians were brutally murdered in this bloody sequence, as Cossacks killed men, women and children. Famously, a baby carriage was depicted rolling down the staircase.

In original context, the Odessa Steps sequence was meant to demonize the Imperial Regime, to expose the fact that there was no depth to which it would not sink to hold onto to power in Russia. The scene is so famous in cinema history that some people have apparently believed that there was a massacre on the Odessa Steps even though the incident was a fictional one concocted for the film.

Those who accuse De Palma of lifting the Odessa Steps sequence from The Battleship Potemkin should take one extra step -- beyond that of accusation -- and ask themselves why? What purpose does it serve to feature a similar sequence here, in this movie?

On one hand, we can certainly point to the deliberate homage and intertextuality we see throughout De Palma's canon. But furthermore, there's a reflexive quality to this reference in The Untouchables. To wit: the battle for capitalist control of Chicago is occurring, roughly, in the same time period that The Battleship Potemkin was made and distributed (circa 1925 - 1930). In other words, by cutting and shooting a sequence just like the Odessa Steps, De Palma is actually reflecting something that the characters of the time might have themselves conceivably understood or known about.

Much more importantly, however, De Palma has created a thematic relative of Potemkin; a kind of "pop" form of propaganda; a heroic myth elevating the G-Men in stature and deriding a corrupt system and the criminals -- like Capone -- who exploited it (the capitalist equivalent of the Tsarists).

De Palma's point -- captured beautifully in the slow-motion shoot-out -- is that Capone's Regime (like that of the Cossacks...) boasts no moral compunction about the murder of the innocent. It will hold onto control any way it can, as we have seen in the corner saloon bombing and now with the imperiled baby carriage. Ness's task is much more difficult: he must eliminate the entrenched, powerful bad guys (the hench-men of Capone) and defend the innocent simultaneously. Remember how that grieving mother told Ness to get Capone? Well, here Ness lands in an even more urgent variation of that scene: finally in the position to prevent the death of an innocent at the same time that he takes down the guilty.

So, yes, De Palma pays tribute to Eisenstein's shock cutting in the famous staircase battle, but he has done two other important things as well. First, he has raised audience "ire" over Capone's actions in the self-same manner as Eisenstein did in regards to the Tsarists;" exposing" a corrupt regime in the process. And secondly, he has re-purposed the "lifted" sequence so as to make a point about the nature of the all-out battle Ness is fighting.

Amazingly, De Palma crafts an action sequence in the very film language appropriate to the era of his film, the 1920s-1930s. In his review, critic Hal Hinson called the staircase shoot-out scene De Palma's "greatest stunt," only-half impressed, but I suggest that given the context, given the reflexivity, given the re-purposing of a classic sequence for a like thematic purpose, it is much more than a stunt. This is De Palma conceiving and deploying brilliant visuals to chart for audiences the epic nature of the Capone/Ness conflict.