–history— needs another - at the beggining.
No vote, but a picture would seriously help this article.
Fantastic. A take on the mirror world that is completely removed from SCP-093.
Suggestion: "bullet wounds" instead of "shot wounds".
When I read the past version of this post, I thought you meant that this SCP was the number that you couldn't remember, so I checked the number. I noticed that if one rotates 1691 180°, it stays the same.
The revolving door in the image clearly isn't mirrored.
This is pretty cool, but I have a nitpick with the story.
I like the majority of the article. The door was in a building and it was anomalous. Anyone going through the door would end up outside that building again, but in mirror world. Everyone in mirror world is the same as us, doing the same things, except everything is flipped left-right. The Foundation (in both regular and mirror world) finds out about the door and secures it in a test facility. Now when someone goes through the door, they end up in a test facility room.
The reveal in the incident log throws me off though - that the mirror society is super violent. That's a major difference that has huge repercussions, and will completely reshape a reality. One thing that bothers me about that is that the violence doesn't prevent or postpone the births of any doppelgangers, so everyone here has one there. And doppelgangers aren't dying off sooner than non-mirror versions. Also, society with an "eye for an eye" social contract keeps prisoners to supply D-class personnel?
Now, I think a few minor changes could fix this. I love the idea that the society was put "out of synch" by an breakout from SCP-████. Many SCPs are otherworldly, and it would make sense that their actions would be the unpredictable element between mirrored worlds. That unpredictable action ruined the balance between the two realities, and the mirror one starts to break down. Honestly, the scale of that breakdown is up to you, and would work best at the smallest believable level - that the Foundation is now believed to be a threat by the mirror Foundation. Considering the lengths our Foundation would go to protect the world, the mirror Foundation would put no less into containing this threat.
Anyone picturing the mirror universe from Star Trek? Anyone? <crickets>
A couple of things that broke my suspension of disbelief. I have trouble believing that the Foundation, either theirs or ours, would have not done a physical exam on any of the SCP-1691-1 that came through. Even a cursory exam by a competent professional would find evidence of sinus inversus (the point of maximal impulse of the heart would be displaced to the right and others), and any type of x-ray or scan would find it instantly.
Also, upon the return of the corpse of SCP-1691, no one thought to include a note explaining what happened? They still might have shot our good Dr. ████████, but the Foundation is nothing else but thorough.
Third, the second-to-last paragraph sounds more like an addendum from a high-ranking official than part of the description. Waging war through a one person at a time doorway would be difficult, and sending a bomb through would probably destroy or severely damage the doorway (since a bullet cracked one of the mirrors).
No vote for now.
This ^, all of it. Especially the star trek. I kept waiting for a note about how the dopplegangers were all identical, except for goatees.
The threat assesment was what killed this for me. It is stupidly easy to stop any level of threat that must come through a known point. Just think of what the Spartans could have done if that pass was only a couple feet wide. If nothing else, attach a little robot arm that will automatically spin the door back around and shift any bombs or what-not back into the mirror-verse before they can go off.
*edit* now that I think of it, how does the Foundation know so much about the society of mirror-verse? They only had the one subject, and there is no mention of an interview, before all contact is cut-off by hostilities.
Originally, the deal with the world inside SCP-1691 being more aggressive than this one was to make the whole thing more worrying. But it's clear that it doesn't really work. Would the article improve if I removed the part about the increased aggression but kept the idea of the mirror world falling out of synch, likely because of the unnamed SCP that kills the D class's doppelganger? Is merely odd and unpredictable okay?
I'll be making a few more minor changes to deal with other problems that have been mentioned, but that would be the main one. I kind of don't want to end up sabotaging this seeing as it's done so well so far.
Like a lot of other commenters above, I liked it up until it was the mirror universe from Star Trek. It doesn't make sense with how identical the two appeared to be initially, and it's a lot less interesting to have a world that's like ours BUT EVIL than to have a world like ours but suddenly put slightly out of sync, butterfly-style.
How is this not Keter, though? Having a two-foot-wide choke point doesn't make defense easy when your opponent is another Foundation. What if the mirror world decides that, hey, our reflections killed our researcher, they're clearly a threat, and we also have this hard-to-destroy reptile we've been meaning to get rid of, why not toss that through the door and see what happens? The Spartans could have held a two-foot choke point, but only because their opponents weren't anomalous.
EDIT: I mean, SCP-1322 is Keter, and it's an even smaller choke point and its weapons are relatively mundane. A hostile Foundation is infinitely more dangerous and unpredictable than that.