Omission Effect - Tumblr Posts

I do love the Unsleeping City but the grit in the oyster for me is the umbral arcana - because what exactly is the governing principle behind what it does and doesn't hide?

So in @merelyroleplayers: Vigil I did my own version called the omission effect, which

a) doesn't stop anyone seeing anything, just makes you incapable of transferring certain events, beings and phenomena from short- to long-term memory

b) was recently revealed as being governed by a repressed Regency-era lady, who sits in a dead end dimension reading transcripts of reality written by abducted and brainwashed clairvoyant stenographers and censoring anything she considers improper