Describe a book or film that made a strong impression on you.

The film I'd like to talk about is The Shawshank Redemption, which I first watched as a university student on a rainy Sunday, expecting nothing, and which has stayed with me for fifteen years since.
On the surface it's a prison story: a banker, wrongly convicted of murder, spends two decades inside a brutal penitentiary. But the film is really about how a person protects their inner freedom when every external freedom has been taken away. The main character never rages against the walls; he plays a longer game, quietly, for nineteen years — and the ending, which I won't spoil, is one of the great payoffs in cinema.
What impressed me wasn't the plot twist, brilliant as it is. It was one line: 'Get busy living, or get busy dying.' I watched the film again during the hardest stretch of my career, when I felt thoroughly stuck, and it landed completely differently — hope, the film argues, is not naive optimism but a discipline you practise daily.
I've probably seen it five times now, and unlike most films it grows with each viewing, because you notice how early and how patiently everything was set up. That, to me, is the mark of a masterpiece.