Any time deep focus was impossible—as in the scene in which Kane finishes a negative review of Susan's opera while at the same time firing the person who began writing the review—an optical printer was used to make the whole screen appear in focus, visually layering one piece of film onto another. However, some apparently deep-focus shots were the result of in-camera effects, as in the famous scene in which Kane breaks into Susan's room after her suicide attempt. In the background, Kane and another man break into the room, while simultaneously the medicine bottle and a glass with a spoon in it are in closeup in the foreground. The shot was an in-camera matte shot. The foreground was shot first, with the background dark. Then the background was lit, the foreground darkened, the film rewound, and the scene re-shot with the background action.