We have a 'horizontality' to our vision, not because our eyes are side-by-side, but because that's how we interact with the world; and how we grow up doing so[1]. We have a slightly narrower arc of vision vertically due to brow and cheek, but even so, the stuff we see 'up' and 'down' is low-density information.
What's happening in the sky or on the ceiling isn't particularly useful to us, and as long as we have reasonably sure footing, the same is true of the ground or floor. We spend our days interacting with things mostly in the horizontal visual plane. Things that we approach or that approach us mostly move in this plane as well.
What's happening in the sky or on the ceiling isn't particularly useful to us, and as long as we have reasonably sure footing, the same is true of the ground or floor. We spend our days interacting with things mostly in the horizontal visual plane. Things that we approach or that approach us mostly move in this plane as well.
[1] There were a few famous experiments a few decades ago showing that what we see as we grow up affects the development of the visual system: https://computervisionblog.wordpress.com/2013/06/01/cats-and...