Per 
SCP-XXXX
Item #: SCP-XXXX
Object Class: Safe
Special Containment Procedures: SCP-XXXX is to remain in Vault-12, and should not be entered without approval from the current site director.
Description: SCP-XXXX is a wooden door. Upon stepping through SCP-XXXX, an individual becomes superposed between an unknown amount of realities. Said individual will remain in this state until someone checks which reality they are in, destroying the other realities in the process.
A better explanation of this anomalous effect can be seen in the "Schrodinger Cat" thought experiment. If a cat is in a box, an outside observer would be unable to know if said cat was dead or alive without opening the box. As such, until the box is opened the cat is both dead and alive. This special state of being collapses upon opening the box, wherein the cat is either dead or alive.
Similar to how the cat can be both dead and alive, subjects who enter SCP-XXXX exist in multiple realities at once. Furthermore, like said cat, a subject inside of SCP-XXXX will only exist in one of those realities when someone checks their location. This can occur by communicating with said individual, or by reading transcripts of past conversations.
SCP-XXXX-1:
SCP-XXXX-1 instances are human eyes that have a radius of approximately 0.5 meters. Said eyes contain white feathered wings that enable them to fly. Despite not having a mouth, SCP-XXXX-1 instances contain the ability to speak to others via a currently unknown mean.
Addendum 1:
The following is an experiment log recorded by Junior Researcher Grey. It should be noted that this experiment was originally supposed to be performed by Dr. ███████, while Ms. Grey observed and helped when necessary. However, due to a last minute familial issue, Dr. ███████ was unable to perform this experiment, and authorized Ms. Grey to perform it in his place.
Note from Dr. Grey:
I am so excited! My first SCP! I cant wait!
Date: September 8, 20██
Time: 6:38 PM
Procedure:
D-3903 was given a portable communication device, and was instructed to enter SCP-XXXX. Below is a recorded transcript of said device.
D-3903: I'm in a city, although there doesn't appear to be any people here. There are also empty cars strewn about this place.
Dr. Grey: Can enter one of the buildings?
D-3903: Sure.
D-3903 failed to enter several buildings on account of a locked front door
D-3903: Alright, last try… I'm in.
Dr. Grey: Great! What is its interior like?
D-3903: This place looks like it was a shoe store, but none of the shoes on display look to be for humans. The shoes all appear to be in a weird Y shape.
Dr. Grey: Are there any other floors?
D-3903: Yeah, I see a staircase in the corner. Give me a sec, I'll let you know when I'm on the next floor.
The sound of steps in a metal hallway can be heard for several minutes
D-3903: Alright, I'm on… floor 42?! How?! I only walked a few flight of steps.
Dr. Grey: What is this floor like?
A door opening can be heard, followed by a thud and panicked scream from D-3903
D-3903: Holy shit, this place is a fucking deathtrap!
Dr. Grey: Are you okay? What happened?
D-3903: Turns out that floor 42 is the roof… and that the roof is just a wedge. I managed to clamor back into the stairwell before falling out.
Dr. Grey: Jesus… That sounds awful.
D-3903: The fuck… There's a floating eye- ack!
The sound of a body falling down a flight of stairs can be heard, followed by a deep voice (hereby referred to as SCP-XXXX-1)
Dr. Grey: Are you okay?
SCP-XXXX-1: You do not belong here. Your kind is tainted with filth.
Dr. Grey: What do you mean?
SCP-XXXX-1: You think that your traps me, but it doesn't. The door traps you, and you gave me the key. I command you to open the door, to let me clean your world.
Communication is lost at this point. A few moments later Ms. Grey could be seen entering SCP-XXXX after allowing 12 SCP-XXXX-1 instances free. These instances proceeded to kill ██ personnel, and indirectly caused the breach of SCP-████, ████, ████, and ████. As of yet, none of the 12 SCP-XXXX-1 instances have been contained.
