What...
Deja-vu is the feeling that someone has experienced this before. “This” could be as simple as a smell, or as complicated as a whole conversation. Some humans believe it is a result of multiple timelines or dimensions leaking into our subconscious.
I know this.
Quite often it occurs simply because memories aren’t perfect, and the person experiencing it has smelled that flower before but can’t place where or when. Occasionally the feeling will pop up because a conversation was held in a dream, or they suspected so strongly a person would say this that their mind recorded it as a memory.
The story has been illicitly taken; should you find it on Amazon, report the infringement.
It’s a mirror.
Of course, it is possible that the feeling is a result of supernatural or psychic influences. Absence of proof is not proof of absence, after all. No one exists who can explain every strange thing humans experience.
How do I interact with a mirror?
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The light touched the mirror. It slid off the rope, moving more like syrup than light.
The sensors on the mirror came to life, registering it as a packet. The computers activated, doing whatever complicated thing they were supposed to do with light packets. The device that turned light to solid objects shimmered, creating something.
It was human. An adult human, in an old uniform, who had apparently forgotten how to breathe.
Everyone on Mirror Station 07396 panicked as this new human collapsed.