The same colour can be a connected symbol

In films, the same colour can be a link between different frames. We connect different objects with the same colour. Because of the changing objects, the audience can focus on the same colour and think about what is the relationship between these images. It can have the effect of metaphor for the film.  Sometimes, it also can create the new meanings for the story.

Like this advertisement. The blue colour is the main body to link different objects, make the film more consistently. During the audience watch this advertisement, the blue colour was repeated again and again through these visual images. It can make the audience remember this color or symbol. So that it also achieved the purpose of the advertisement - let the audience remember it.