Curved visual space

As a way to dismiss sky measurements or explain flerfspective, flerfs often say “we see in curved visual space.” Some notable purveyors of this retort are Austin Witsit and Kaleb Davis.

Another phraseology is “we see in hyperbolic geometry, not Euclidean geometry.”

It comes from a paper that studied human visual processing and spatial judgment after an image has already been converted to nerve signals; in other words, not related whatsoever to optics or the geometry of light.