The Cuil is a simple measurement to allow you to gauge reality with a quantifiable number but it is so much more.
The universe is a great mesh, a grid hanging in the void - stretching forth into infinity in all directions in space and we, everything in the universe hang upon that mesh and the Cuil is the number, the distance between us on the mesh, everything we do is played out upon the great mesh and the closer we play to the center, the closest to reality, which around everything revolves the smaller that distance becomes.
But the center is elusive, the center is deep - its stretches back away from us into infinity, ultimate reality, the absolute negative lower bound of Cuil, as it is the most all-encompassing real thing possible - the Reddye-number -∞‽ .
Thus negative Cuil is something striving towards this number - pushing back away from us on the mesh, stretching back this reality can be hard to see, it confuses us with it's sheer pure realityness of it.
We are one with the mesh.