From SCP: Secret Laboratory English Official Wiki

The Clutter System is a Mechanic in SCP: Secret Laboratory used to customize rooms. This system allows props to be randomly spawned in a room, allowing hallways and rooms to have more variance.
Currently, the system is only used to spawn Sinkholes in Light Containment Zone, while also being used to spawn in props for both Halloween and Christmas throughout Site-02.

LCZ Sinkhole

The Sinkhole

If turned on by the server owner in the configs, Sinkholes will have a chance to spawn in any LCZ 4-Way Intersections.
Humans will be slowed down while walking in a Sinkhole (SCPs will be unaffected).
Unlike in Containment Breach, Sinkholes will not teleport the player to the Pocket Dimension; this is intentional.

Seasonal Props

During certain times of the year, seasonal props will spawn around Site-02 to fit a seasonal holiday.
The Clutter System spawns Seasonal Props based on the "Universal Standard Time" (UST) time zone, and not the time zone of the player.
Related achievements are not turned on by the Clutter System.

X-Mas Props are spawning!


During all of October, pumpkins and candles will spawn around Site-02.


During December, X-mas related props will spawn around Site-02, while the Surface Zone gets covered in snow.

From December 25th to December 31st, the C.A.S.S.I.E. MTF announcement will be changed to the Xmas version.
Can also be forced to happen earlier and longer by the devs for Xmas Events.

"Tactical Holiday Unit, Epsilon-11, designated, "[Military Phonetic Alphabet-[#], has entered the workshop. All remaining elves are advised to seek shelter in the nearest gingerbread house, until a unit has festivized the facility. Awaiting recontainment of [#] spoil-sport holiday haters. "