Augi is an augmentation intelligence in the shape of a silver choker. It is worn by Isis, a human. Augi perceives the world through Isis' sensory apparatus by detecting electrical impulses traveling from her sense organs to her brain.
In one story, Augi perceives a number of entities which Isis cannot perceive at all. Augi assumed for some time that Isis could also perceive these apparently obvious entities; not the case. I do not make clear exactly what human sensory modality Augi was using that Isis might possess but not be conscious of having. It is dissatisfying. I vaguely thought it might be blindsight. Blindsight is a poorly understood sense of surroundings or spatial position which is exhibited by persons who are blind because of brain damage to the visual cortex in the brain, but not to the eyes. Persons (and monkeys) with blindsight accomplish things that would seem to require vision, without consciously "seeing" anything they can report.
Our other senses have inputs specific to each: we can smell things we cannot see, hear things we cannot see or smell, and perceive textures by touch which we could not with other senses. What would be the nature of an object or entity perceptible only by blindsight, and not by regular sight?
Maybe it is a faux pas to link up stories. If so, moderators please edit this out. If not, here are Isis and Augi. The last story has the events from this question. I blame @Erin Thursby for getting me excited about it again.