A picture taken of SCP-XXXX with the shelves aligned regularly


Object class: Safe

Special Containment Procedures: SCP-XXXX is to be contained in a storage container measuring no less than 3 x 1.5 x 1 metres to account for SCP-XXXX's anomalous behaviour1. No books or other objects are to be inserted into SCP-XXXX when not engaged in testing. SCP-XXXX is to be regularly inspected and checked for traces of paper or other abnormalities different from regular idle behavior.

Description: SCP-XXXX is a mahogany bookcase, measuring around 2.5 x 1 meters. The case has been finished with both a dark wood stain and a polyurethane finish according to chemical testing. The edges of the case are littered with holes which likely held screws or nails at a certain point in history, possibly in an attempt to combat the anomalous effects of SCP-XXXX. Testing has revealed that any screws or nails inserted into the case are forcibly resisted and eventually pushed out.

SCP-XXXX autonomously changes its spatial dimensions (the distances between its five shelves as well as the depth of the entire case) to resist the neat storage of any book. It has two main ways of action: it either changes the space between two shelves to always be slightly too narrow to fit the book standing straight up, or it changes the depth of the shelves causing the back of the book to overhang the shelf by about 3 centimeters. Books which are especially non-compliant with SCP-XXXX's preferences, like books with irregular shapes or books printed in the wrong language, are eventually rejected by shortening of the shelf until the book falls out.

SCP-XXXX's behaviour seems to differ depending on the size of the books which are put in: books which are taller than they are deep are most commonly met with a narrowing space between shelves, while deeper books are often confronted with shortened shelves leading to overhang.2

SCP-XXXX possesses the ability to change its dimensions without any prompt to do so, as observed by security footage of the containment unit it is locked in.

Testing with SCP-XXXX has revealed that the dimension-changing behaviour of the bookcase grows stronger when triangle-shaped objects are put inside, and less prominent when objects with more corners and sides are placed inside. Regular polygons are less severely rejected than irregular ones, but only circular objects have elicited no significant changes relative to SCP-XXXX's idle behaviour.

Through X-ray the build of the case has been shown to be quite unconventional with a double back wall containing multiple pieces of paper, possibly related to its origins or its intended use. Attempts to gain access to these documents through partial destruction of the back wall has led to the traumatic removal of one forearm and four fingers in two seperate D-class personnel assigned to retrieve the documents.

The mahogany is of a subspecies of Swietenia mahagoni which is of import as the case was recovered in [REDACTED], Russia (former Soviet Union) and this wood is native to the south-eastern United States. Dating of the wood by Foundation Carpentry experts has revealed that the lumbering of the wood and most likely the construction of the case took place around 1970, which has provoked further interest in the documents contained in the back board of SCP-XXXX and their nature.

Test log: XXXX-05

Protocol: 5 D-class personnel were to attempt to all insert one book of similar size into a different shelf each.

Subject: SCP-XXXX

Team Lead: Dr Ian


Dr Ian: Alright, I will count to five, and on five, all of you will put your book in at the same time. Is this understood?


Dr Ian: 1, 2, 3, 4, 5!



Test log: XXXX-06:
Test 06 attempted to insert into SCP-XXXX a book trimmed down to only 2 centimeters of depth. In response, SCP-XXXX did not shorten its shelf but lowered the shelf above the trimmed book, crushing the flimsy remains until the back of the book broke. Testing the destructive power of SCP-XXXX is suggested.