I encountered the word "anomaly" used as a literary term in a book I referenced here:
“Status quo” science fiction. . . opens with a conventional picture of social reality. . . This reality is disrupted by some anomaly or change--invasion, invention, or atmospheric disturbance, for example--and most of the story involves combating or otherwise dealing with this disruption. At the story’s conclusion, the initial reality (the status quo) reasserts itself (ix).
Later in the quotation, it's clear that Frank Cioffi applies the term "anomaly" to isophenomenal works as well as metaphenomenal, given that he mentions "crime" serving the same disruptive function in a mundane detective story. One problem with his concept, though, is that the "status quo society" may just as anomalous to the reader's mundane experience as the entity/circumstance that disrupts the society. Thus Dick Tracy's status quo can accomodate anomalous, quasi-futuristic technology like the "wrist radio" in the detective's battle against a horde of freakish criminals, and the status quo of DUNE's Atreides family, with its space-opera resources, is disrupted by the resistance of the equally anomalous Fremen. Cioffi even mentions a similar work himself, Van Vogt's story "Black Destroyer," which pits the crew of a futuristic spaceship against a powerful alien creature.
I spent all this time reworking Cioffi's overly simple schema because I want to rescue a perfectly good term for my own use, which only concerns metaphenomenal anomalies, whichever "side" utilizes them. And that leads me into a development of my somewhat neglected distinctions between "power and potency." given its fullest articulation here.
In that essay I favored these definitions of "power" and "potency."
POWER: The ability to do something or act in a particular way, especially as a faculty or quality
POTENCY: The power of something to affect the mind or body
That essay spoke of distinctions between "body" and "non-body" concepts, more or less derived from my reading of an Octavio Paz analysis. Now, in place of that dichotomy, I would favor the idea that an anomaly that displays "power" to be "active" in nature, while one that displays "potency" is "passive" in nature.
Examples of powerful anomalies are legion, but the POWER AND POTENCY series mentions a number of anomalies, both uncanny and marvelous, in which the anomaly conveys more or less "indirect" influence.
For instance, Part 4 and Part 5 both concern marvelous narratives about formerly mortal men who are brought back to life to fight evil, but who don't possess any special powers beyond the "passive" condition of having been thus resuscitated. Arguably a lot more uncanny narratives invoke passive potency than do marvelous ones, and in LUNATIC LAWMEN I referenced such examples as the psycho-film EYES OF A STRANGER and the near-future "alternate history" film RED DAWN. In both of these movies, the eminent icons-- one a monster and the other a hero-- were in terms of power almost indistinguishable from isophenomenal versions of similar menaces or champions. But both possess what I've called a "larger-than-life" quality, one that references their dependence on artifice more than verisimilitude-- and this emphasis upon the artifice of their natures too is a form of passive potency.

































