Per 
Item #: SCP-XXXX
Object Class: Safe
Special Containment Procedures: SCP-XXXX is self-containing.
Description: SCP-XXXX is the entry for SCP-XXXX in the SCP database. SCP-XXXX does not exist; regular system scans indicate that this page is blank. Despite this, upon accessing the SCP-XXXX file, subjects invariably report that the entry exists, and are able to accurately describe its contents.
Each viewer appears to be able to see a distinct version of this file. Many subjects have reported significant alterations to the contents of the file upon subsequent viewings; the mechanism determining the character and degree of these alterations is not fully understood, although informing the subject of the nature of the anomaly typically produces larger-scale changes. These effects seem to only extend to the database entry itself; reproductions are existent, differentiable, and unchanging once recorded, and can be viewed by others regardless of whether or not the viewer has previously seen SCP-XXXX. (See Addendum 5929.1 for a sample reproduction.)
It is believed that the perceived contents of this file are related to human pattern recognition capabilities.
Addendum 5929.1: Reproduction of SCP-XXXX, excerpted
Subject: D-18477
Notes: Subject previously assigned to SCP-████; termination postponed. Primed on other recently-added short, low-clearance articles before exposure.
