But that cannot be the basis of your reasoning. You cannot simply reject a theory because you can't see it.
Sure I can. If you can't see it and if you can't detect it then it's not valid for consideration. It's about as credible as the idea of ghosts are. It's as simple as that.
1) You can't see or detect a "shadow object" because it's supposedly invisible. (Invisible, but casts a shadow, unlike every other invisible thing.) Yet you base this whole theory on that thing you cannot see or detect.
2) You have never seen an "ice wall" -- merely pictures of the edge of an ice shelf -- yet you base your whole theory on its existence. (Pictures showing earth's curvature don't count, but pictures of the ice shelf count in order to call it an ice wall.)
3) You have never measured the moon, yet you accept as fact its measurement of 32 miles or some such thing. Same for the sun.
4) You have never detected the "dark matter" holding the edges of your flat earth together, yet you believe in it completely.
5) You have never detected the upward movement of earth in relation to a fixed point off of earth to confirm it, yet you blindly accept the idea that earth is rapidly moving upward to keep us from falling off.
Massive contradictions are rampant among Flat Earth theorists. With each thread I read, more come to light.