Rift Experience
We know that there are "cracks" or "rifts" in the natural world. The strings that connects the material world and the mirror dimension are realised as the rifts in the natural world when there is a high concentration of the strings.
How does this happen? Due to migration and movement of different creatures that are connected to the potential the strings get knot up. These "knots" create the rifts that are hotspots of plugged, unstable Potential. The rifts could be described as volcanoes of the potential but look more like a mix of geysers and canyons.
The effect they have on inhabitants are different depending on if they have the Potential or are unsensed.
One with the Potential would experience a mind of supercharge, reminiscent of being on Ecstasy or being drunk. They feel a rush. This is due to them attracting the Potential and inhabiting more than they're capable of.
The unsensed can only perceive the physical attributes around the rift of the Potentiam but can not sense or perceive the actual Potential itself. It appears as being sealed, like a geyser with a lid, while creatures with a functioning auní would perceive the Potential and not a "lid".