Perspective.
I've never learned or though so much about perspective, field of vision, etc. until I started studying Flat Earth.
Study it. Knowledge is always good for you, regardless of one's beliefs about the shape of the earth.
Have you never seen a video of a camera set up 1 foot off the surface, filming a man walking down a bridge (away from the camera)? I never did either, before I studied flat earth. The man's legs will start to disappear. It's crazy, but a very real optical/perspective effect. It's how the world, and our eyes, work.
One thing I learned is that some people (invariably globers) are REALLY stupid on this and many other natural world topics. For example, they think you can see forever by default, and only the "curve of the earth" prevents us seeing for thousands of miles. Seriously? But I've heard real people say this with their own mouths.
Related to this, some idiots say, "If the earth were flat, you'd be able to see Europe and the Eiffel Tower from New York Harbor. Checkmate, dude!"
Have they never studied or thought about perspective, or spent a couple hours outside in silence in their whole lives?
Public schools today, I tell ya! A total failure.
The human eye IS limited in its visual ability. It has a limited angular resolution. It can only resolve objects out so far. And, there IS an atmosphere on the earth, which attenuates objects and even the brightest of lights (such as sunlight). That would be true on a globe OR flat earth.
Of course, those in-the-know are aware that modern public schools were created to form non-thinking, hive mind, uneducated, docile, normie, blue-pilled wage slaves. In that respect, MISSION ACCOMPLISHED.