It’s exciting to see Shyamalan on such confident footing once more, all these years later.
Martin is a blind man who believes anyone might be lying to him.
His lack of trust, which runs so deep it has defined his entire life and personality, began in childhood. It was his mother's custom to describe the garden outside his window to him. One day she told him there was a man raking leaves in the garden. Martin could hear nothing, and decided his mother was lying. He used a camera to take a photograph of the garden.
When we meet Martin, in the opening scenes of "Proof," years have passed, but he is still a photographer. It is his way of checking up on his friends. He takes pictures, has them developed, asks people to describe them to him, labels them in Braille, and is alert to any contradictions in what people tell him. Martin lives alone, in a rigid and compromising lifestyle, and is fiercely independent. If he feels he is being overlooked in a restaurant, for example, he is capable of taking a bottle of wine and pouring it out on the table until a waiter takes notice.
Celia is Martin's housekeeper. Actually, she doesn't need the work to support herself. It is her way of getting into Martin's life. She is a photographer herself. Her walls are covered with photos of Martin. Their relationship is prickly and marked by anger; perhaps Celia enjoys the sharp edge of every conversation.