Memento (2000) revolves around Guy Pearce, a man with short-term memory issues trying to find out who killed his wife. Nolan wrote its screenplay based on a short story authored by his brother, Jonathan. Famously, many of its sequences play out in reverse order.
In the nuclear war epic Oppenheimer (2023), Nolan subtly calls back to this technique. He doesn't explicitly reverse scenes, but he uses flashbacks to play with the flow of events.
Meanwhile, "time inversion" is a visually impressive theme Tenet (2020), while "time dilation" is a central concept in Inception (2010), where the lead character Arthur says: "Five minutes in the real world gives you an hour in the dream."
Colour versus black-and-white
Another signature Nolan move, which skillfully disrupts and enhances the viewing experience for audiences, is his use of colour. He often shifts to black and white, as evident in both Memento and Oppenheimer.
Here, Nolan goes against the popular convention of using monochrome to indicate past events, instead using it to indicate 'flashforwards' – as seen in Memento.
Nolan did this again in Oppenheimer, where current events play out in colour, and those in the future, including the trials of Oppenheimer, are in black and white.
But that's not the only trick in his toolbox. Some are less obvious.
In Insomnia (2002), starring Al Pacino in the role of Will Dormer, a detective with chronic sleep deprivation arrives in Alaska to investigate a murder. Unable to get a good night's sleep and obsessed with the elusive murder case, he deteriorates into a state of mental and physical ruin – eventually committing a grave mistake.
Here, Nolan presents sleep not as a passive act, or a "pause", but as an integral period of time during which crucial events can take place.
A running theme
The connection between the past, present, and future – as seen through Nolan's lens – is also evident in his other films, where multiple worlds seem to "exist" at the same time.