This film is a masterpiece of realist indoor drama during the German silent film period. A tragedy of the fate of a small character basically complies with the triune principle of the indoor drama, and the whole plot is also compressed into what happened within a few days. The film transcends the superficially meticulous and superficial realism. In order to reveal the deeper truth of the characters' spiritual world, the director inserts a famous dream scene, which has an expressionist color. The film has become a masterpiece of film history because it is a revolution in film technology. The film rewrites the lens script according to the movement of the camera. The camera is unconventional and becomes an organic part of the plot development, becoming a character in the story. The actor is not arranged in front of the shot, but the camera is allowed to capture the actor's movements by surprise. Due to the movement of the camera, the three-dimensional sense of the picture is greatly enhanced. Using different viewing angles to express specific content is also the style element of this film
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