I get this on flat monitors actually. Sometimes I'll come home from a day of being outside, and it's really really clear that it's just a picture on a screen, and it feels really flat, small and hard to immerse in. But usually I can feel like I'm basically in the world, with a good sense of scale and depth.

It makes me think that perhaps it's not physical but an internal interpolation occurring. I am way out of my depth in that discussion, but it feels like a suspension of disbelief but for interpreting visual input.