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Motion is a universal language. It's understood by everyone in varying degrees. Look at it this way: If something whizzes across the screen, it communicates "fast" or "urgent." And the slow move can communicate "calm." It's really about rhythm, and we all understand that language.
But, let's take it a step further. It's one thing to recognize that motion and rhythm are universal forms of communication. Fairly obvious…but communication through motion is deeply embedded in our culture in other ways. Example: Have you ever heard a movie described as being "too MTV?" The quick edits typical of music videos have become a property of the MTV brand. By establishing a particular motion-based style, MTV has added a huge attribute to its brand.