Page "180-degree rule" Paragraph 12

In Peter Jackson's The Lord of the Rings: The Two Towers, Gollum has a conversation with himself or with his other personality.

Because the filmmakers use the 180-degree rule, and have the " good " Gollum looking left as he speaks while the " evil " Gollum looking right, the audience perceives Gollum as two different characters talking to each other.

This effect builds gradually during the scene: the first few times Gollum shifts between personalities, he is shown starting to turn his head, though the camera changes angles mid-turn.

As the argument between the split-personalities intensifies, the editing gradually changes to using jump cuts, not showing Gollum turning his head.