Why your dialogue looks like two people 'looking the wrong way' after the cut
When two people talk face to face, there's an invisible 'line' between them. As long as the camera always stays on the same side of that line, when you cut the shots together A always looks right and B always looks left, and the audience instantly understands who's talking to whom.
But the moment you move the camera to the other side of the line (called 'crossing the line'), the two suddenly look the same direction when cut together — as if looking the wrong way, with their spatial relationship scrambled. This is the culprit behind a rookie's dialogue scene always feeling off.
Remember one thing: don't jump over that line
The 180° rule: think of the imaginary line as a wall, and let the camera move freely only on one side of it — then you won't go wrong. If you really want to cross it (to create chaos or imbalance on purpose), use a moving shot as a transition to carry the audience across; otherwise it's a continuity break.
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The imaginary line between two people in a conversation that the camera shouldn't casually cross is called the ___ (of action).
答案：axis
This imaginary line is the axis (line of action); the matching shooting rule is the 180° rule.
You're shooting A and B in conversation: the first shot has the camera on the left side of the line between them, and for the next shot you move it to the right side — what happens?
答案：You crossed the line, and their directions get scrambled in the cut
Moving to the other side of the line = crossing the line; cut together, the characters' eyelines get scrambled and the audience can't tell who's facing whom.
True or false: the line rule is only useful for dialogue; chases and ball games don't need it.
答案：False
Any scene with a clear sense of direction (a chase, a standoff, a ball game) needs consistent direction — the line rule applies just the same.