Nolan's work is often based around an emotional or conceptual theme.
Memento is about guilt (Leonard's failure to save his wife and inability to remember what he has done about it since), the nature of personal
identity, and the human reliance on
memory. Insomnia is about guilt (Dormer accidentally kills a friend) and the human reliance on
sleep. Batman Begins is about guilt (Bruce Wayne's belief that he was responsible for the deaths of his parents) and the nature of
fear. In
The Prestige, Nolan focuses on guilt (Angier's anger over what happened to his wife) and the idea of obsession (the rivalry of the two magicians and the two inventors).
Also, obsession is another one of his recurring themes, in
Memento, Leonard is obsessed with finding his wife's rapist and killer, in Batman Begins, Batman is obsessed with reducing crime and avenging his parents and in The Prestige, Angier is obsessed with destroying Borden. In all cases, obsession makes the characters risk their mental or physical health.
The way extreme states of the mind can distort perception of reality and ability to function also seem to appear constantly in his work. In
Memento, it was a memory disorder making the leading character lose his skill to retain knowledge. In
Insomnia, lack of sleep induces the protagonist to lose concentration and energy. In
Batman Begins, intense - and sometimes induced - fear constantly makes characters perceive people and things as more dangerous than they really are. In
The Prestige, obsessive behavior turns two friends into rivals and sends them into a downward spiral.
Another is that of a protagonist as a vigilante hero. In
Memento, Leonard takes it upon himself to avenge the apparent murderer of his dead wife. Insomnia's Detective Dormer plants evidence to incriminate criminals who escape 'the system'. He secretly works behind the backs of the authorities to reach his own sense of justice. In
Batman Begins, billionaire Bruce Wayne takes to the streets as an avenging
superhero, preying on the criminals that go unpunished by the police. In
The Prestige, a magician attempts to sabotage the career and life of a rival whom he blames for the tragic death of his lover. Invariably, the vigilant protagonist accomplishes his ends, but makes great sacrifice of either his own life, morality, or chance for happiness.
He is also known for using non-linear storytelling. This was most notable in his films
Following,
Memento and
The Prestige where scenes are shown out of sequence, often causing the viewer to question what is really happening in the story. His films
Insomnia and
Batman Begins have a more linear storytelling format, but still heavily incorporate flashbacks into the plot.
Additionally, Nolan frequently works with cinematographer
Wally Pfister, production designer Nathan Crowley, editor
Lee Smith, actors
Christian Bale and
Michael Caine, and his brother, screenwriter
Jonathan Nolan.
Nolan also seems to be a fan of the British rock band
Radiohead, as in
Memento he tried using "
Paranoid Android" by Radiohead for the closing credits. This couldn't be done due to the budget of the movie itself. However, in
The Prestige, the end credits include the song "
Analyse", a song from
The Eraser, the solo album by Radiohead's frontman
Thom Yorke.