In the now distant past, one popular attraction in a theme park (then, called an "amusement park") would be a fun house, or maze . My favourite section of a fun house would be the "hall of mirrors" - a maze where all of the walls were mirrors. One person, entering the hall at one end would be seen in dozens of mirrors, all reflecting an image from other mirrors. You would see one person, and would have fun trying to decide whether that person was right in front of you, or perhaps a few feet away from you, with his / her image reflected off dozens of mirrors.
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