Generally, the screen is the viewer’s window into the film’s world and it behaves like human eyes: you see one image at a time. But film can be a lot more flexible than that. You can, in fact, be more creative and see more than one image at the same time, each battling for your attention or complementing one another. The most traditional reason to have two images side by side is for telephone conversations so you can see both people talking and, more crucially, their reaction to what they’re hearing. But you can also work with a smaller image, tucked away in the corner of the screen to create an observer of the larger action, for instance. You could also find a creative way to make both images interact with one another.
iMovie’s interface appears to be designed to only handle a single layer of video and you can only put one clip before or after another. But, using iMovie’s Advanced Tools, it is possible to create both of the effects described without having to purchase a more expensive application.
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