Split Screen Recearch

Traditionally split screen is the visible division, in half, of the screen showing two events or of simultaneous events. In more modern media this can been adapted to make an easy way of having a character appear in the same scene or shot more than once at the same time.

Split screen can be used in many ways. The two we are interested in are; the one shown in 500 days of summer, when there are two version of the same scene but with different things happening, e.g. shown here are expectations vs. reality. And having a character appearing twice in one shot, so using a locked off camera and shooting a scene on one side of the screen, and then another on the other side of the screen and editing the two together, and because the  camera never moved the split in the middle should be invisible.
 

Expectations vs. reality:

This is done by shooting two separate scenes, they can use different camera angles and shots and editing them together to show an obvious division to the audience. This can be used to create an alternative scenario, life, or parallel universe.

Double character:
 

This is a fairly simple way of creating the illusion that a character is in a scene twice at the same time. The camera never moves position, and the scene is shot twice, but the character can never cross the line of which the screen will be divided. Then during editing you put the two scenes side by side, cutting out the side on both scenes and replacing it with the other version. If the camera didn’t move the split should be invisible and the characters should give the impression of being in one scene at once.