An antimeme is an idea that resists being spread. Self-censoring. Hard to hold onto, harder to write down. The ordinary versions are everywhere: passwords, taboos, a block of text boring enough that nobody finishes it.
This one is about the dangerous versions, and about a containment division responsible for threats nobody can remember encountering. Including, some of the time, itself.
It started as SCP Foundation fiction in 2008, ran as a web serial through 2015 and 2016, and Penguin Random House published a reworked version in November 2025.
It is filed under horror and that is the right shelf. The horror is epistemic. You cannot trust that you would notice.
I ran national technology across 37 associations, and institutional memory behaves a lot like this. There is always a decision nobody can reconstruct, a system nobody remembers approving, a reason something is wired the way it is that walked out the door with the person who wired it. The book is fiction. That part is not.