Multiple Mirror Effects in Movies

The Haunting (1999)

Spoiler Alert !

Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
 
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Inside a haunted mansion, Nell (Lili Taylor) sees her reflection in a mirror but the person she sees is not herself. She runs terrified into a room full of mirrors with a round floor turning like a carousel where she sees a reflection of herself with a growing belly as if she is rapidly becoming pregnant.

Watch the scene on YouTube