Our brain does non-trivial but deterministic visual processing. When you ask a surgeon after performing an eye surgery, they often mention that their patients s

Our brain does non-trivial but deterministic visual processing. When you ask a surgeon after performing an eye surgery, they often mention that their patients see the world like through camera/with computer game perspective projection (pinhole model etc., the usual "wrong" projection used nowadays). After their eyes heal, vision returns back to normal (i.e. you don't see curved walls like in a camera but they are nicely straightened for you by your brain). Moon effect might be based on some of this processing; it seems horizon might play a larger role in our vision.