The magic of their farewell is a duet of sound and image. The words belong sonorously to Humphrey Bogart — and great words they are, including the rhythmically unforgettable “maybe not today, maybe not tomorrow, but soon, and for the rest of your life”. But while he’s reading what amounts to a monologue, the camera lingers insistently on Ingrid Bergman’s face, never more exquisite, thanks to the smokey lighting of her left profile, as she silently absorbs his advice.

There’s the inconsolable tip of her chin down, then Bogart gently lifting it back up, with: “Here’s looking at you, kid”. Both actors were near the beginning of their stardom, but it was at precisely this moment that audiences fell in love with them.

Behind the scenes..