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So let me do the same analysis on this one (on the other side).  This assumes the princple that the "Horizon being always at eye level is only possible on a flat plane."

#1) is it provable from these pictures that the horizon is actually at eye level?  These are pictures, so could the angle have been changed so that it only appeared that the horizon is at eye level?  If the horizon were below eye level, and I tilted my camera slightly downward, would that make it seem as if the horizon is at eye level even if it's a bit lower?

#2) is it really true that the horizon always being at eye level is only possible on a flat plane?

Well, I believe #2 to be correct based on some other videos that I have seen on the subject ... which seem to demonstrate this visual phenomenon.  But it's not proven just by this picture alone.  And then there's a question of how the pictures were taken or produced.  So this is presented as proof, but it does not prove anything on its own.

I hope your tendencies remain consistent with the Dogmatic Flatearthists on this site. In fact, one would be hard pressed to find someone here who isn't dogmatic about it, who favors flat-earth. I can't help but hold animosity towards the FE position merely because of the words written here by the "Catholics" who push it. I am usually inclined to be open to counter-mainstream arguments and "theories" and that's the reason I didn't dismiss FE right away. It wasn't until I saw the people here pushing it and how they were doing it, that I realized this has got to have diabolical roots.

You'll need to prove the so-called diabolical roots of the flat earth position.  Saying it automatically makes you a dogmatic globalist.  Prove your position.  We've provided page upon page of proofs, including:
The idiots that run our world also insist earth is a globe (like you do),
NASA, RASA and other Freemasonic space agencies that control science are proven liars and still insist we went to the moon
The myriad of ways the world suffers from the condemned Copernican Revolution of the last 500 years
That heliocentrism, the science of the globe, was condemned by the Church,
That Fathers of the Church who taught flat geocentric earth provide a beautiful relationship of earth to the tabernacle and liturgy,
The reasonableness of flat earth with regards to what is level and what is curve
Scripture quotes on the form of the earth only support flat earth
The impossible logistics of the globe  
Ancient cartography of Catholic mapmakers
Empirical math and scientific proofs,
The warning from Scripture and from the Saints about science falsely so-called
The relationship of science falsely so-called to the imminent collapse and chastisement of the world  
All this has been covered, and more. Whether you believe it or not, it is a cohesive and well founded argument expounded upon as a whole in these threads. The information is verifiable and remains a tower against whatever spit wads you lob at it.  Not one of you globalists has offered anything but sporadic contentions, parroting anti-Catholic sentiments of the globalists. You offer a piece meal defense against a juggernaut of spiritual and physical truths. 100% of the time your claims are "no, it can't be that way" or "you're stupid", rather than explaining how you shamelessly promote what the nєω ωσrℓ∂ σr∂єr globalists do. You literally sneer at information we've provided, but most importantly, you do it without consideration. A reasonable person digests information before he spouts, asks questions, takes the time to get to the bottom of what is being said.  That NEVER happens with dyed in the wool globers, proving that indoctrination warps minds.  Modernism has been described as a system of thinking that enables one to reconcile within himself two opposing beliefs.  Globalism is the poster child for modernism and remains a scientific relativism that is undermining Christendom.            

I do not have a lot of God-given talents, but I am very skilled at shredding bad arguments to pieces.  I can see logical flaws miles away and rip them apart in seconds.  Other than that, I have a very poor memory, and not very many talents in other areas.