Lighting

http://www.youtube.com/watch?v=rm39m8LWqUI

At the begginning of the film, high contrast lighting is used to show a contrast of the main character's personality being left in the dark in juxtaposition to him being lit up as he talks. This shows an insight to what he could possibly be displayed as but still is limited to what he may act like within the rest of the film. It also shows a possible sinister side to him as you can only see him and not the surroundings around him.
Key lighting is also used to show the main character in different sections when explaining what he wants in his life.
As mysterious music starts to play and Bronson is seen pacing up and down the cage, naked, the low key lighting reflects the hard exterior he portrays, as well as the red filter which connotes blood or violence.
The rest of the lighting is mainly high key lighting to contradict what is going on within the plot of the film. It shows real day life in a positive way in contrast with the actions of the main character, which are of a horrible nature. This makes you question the personality and state of mind, of Bronson.