system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the cameraman not visible in mirror scenes in movies, how are those scenes shot?
gpt
The actor can see the camera in the mirror, but because the camera is not directly in front of the mirror, it cannot see itself.

Find someone who is looking into a mirror.  Now stand to the side, so that you are no longer in front of the mirror.  You can see them, but you cannot see yourself.