Great comment. You are right in your first line. You think you haven't seen it so you don't believe it. Beliefs are religious, knowledge comes from natural, repeatable, observable, measurable tests. We use natural scientific experiments to prove there is no expected curvature for a globe of 25,000ml, I did my own experiments and found there is no curvature! This made me research deeply, daily, for the past three years. I answered many of those questions I had, like you have, for myself, slowly, over time, as realisations burst and new information arrived. If you slowly work through all of the supposed "proofs"for a globe, you debunk them quite quickly. It is breaking down a lifetime of mind conditioning that really takes months or years to degrade. I hope you don't close your mind to any new information, and stay tuned for the rest of the series, maybe it will answer some of your questions, inadvertantly, or maybe it will make you go seek further clarification for yourself. “If you find from your own experience that something is a fact and it contradicts what some authority has written down, then you must abandon the authority and base your reasoning on your own findings.”

― Leonardo da Vinci