Film noir has never been a 'clean' genre. Nor is it in the history of cinema, where it tends to defy definition like an underdeveloped photograph. People talk about shadows, detectives, enigmatic women and cities at night. But these are labels. In reality, film noir is a lingering feeling: that life always has a second meaning, and that this meaning is not reassuring.

It is curious that many of his most powerful images come from films that did not claim to be noir. Noir often emerges later, in the minds of viewers and critics, as if time needed to invent it in order to explain a certain unease.

In The Mystery of the Falcon, for example, it is already all there: the object as an obsession, conversation as a mask, and truth as something that can never be fully grasped. But it is not yet a system. It is a world that is learning to distrust itself. The characters move as if they know that every gesture can be interpreted in a different way. The detective does not merely solve a case: he navigates through a series of possible versions of reality.

Then comes Casablanca, which is often removed from the genre of film noir and relegated to romantic melodrama or nostalgia cinema. Yet it is difficult to ignore the extent to which it is structured according to a typically noir logic: the impossibility of a clear-cut choice, morality bent by history, and the past returning in the form of an irreversible decision. Rick is not a hero; he is a man who has learned to come to terms with loss. In this respect, the film leans more towards disillusionment than consolation.

If you look at film noir without too much deference, it is always a matter of compromise.

In The Flame of Sin, the discourse becomes more distinct, almost schematic in its moral precision. Here, there is no longer any room for romantic ambiguity. Desire is a self-destructive narrative construct. The narrator's voice saves nothing; on the contrary, it seems to be recording a confession that has already taken place. Crime is not the exception: it is the method. And the very language of the film becomes part of the betrayal.

If one were to look for a common thread, it would not be found in the plot, the characters, or the endings. Rather, it would lie in a certain notion of urban destiny. Noir cities are never mere backdrops. They are moral systems. Streets that lead nowhere, offices lit by dimly glowing lamps, hotel rooms where time seems to stand still. Everything is constructed to suggest that freedom is merely a variant of entrapment.

There is a tendency in film criticism to romanticise film noir. To turn it into an elegant aesthetic of despair. However, this is a belated interpretation. In the films themselves, there is something more raw, less controllable. The characters are not symbols: they are people who make mistakes with a disturbing consistency.

Perhaps that is why film noir endures. Not because it is stylistically recognisable – the light–shadow contrast, the trench coat, the glass of whisky but because it continues to provide a framework for considering human error without reducing it to mere accident.

Today, the posters for these films reinforce this impression. They are not mere promotional tools. They are visual condensations of a moral world. A face cut off by the light, a gun out of focus, a woman who never looks directly at the viewer. These are images that promise narrative clarity but instead deliver ambiguity.

Watching them again, one gets the impression that film noir was never really a distinct era of cinema. Rather, it is an intermittent mode of perception. It reappears every time cinema stops trusting its own stories and begins to observe what contradicts them.

And perhaps this is its most enduring characteristic: it portrays evil not as an exception, but as an ever-present possibility. Not as a spectacle, but as a structure.

Film noir does not explain. It suggests. And in doing so, it leaves behind a question that cinema has never fully answered: to what extent are we willing to recognise, in its characters, something that closely concerns us?