"The universe is not only stranger than we imagine;
but stranger than we CAN imagine."
-J. B. S. Haldane
Although all kinds of strange things may be possible, we still have to use our senses and critical thinking to understand our world as accurately as possible.
That is why ideas like the "flat earth" movement drive me nuts. It's just stupid. There's nothing about the reality that we experience that would make it probable that the Earth is a flat disc. Matter naturally accumulates into a sphere, as gravity pulls mass toward all other mass. Look at water droplets, bubbles, etc.
When looking at other celestial bodies it's clear that they have to be spherical in nature. This is self-evident, unless you believe that there is a massive conspiracy involving literally every space agency, astronomer, & anyone who's ever looked through a telescope.
As with so many things in today's interconnected world of limitless digital media, it's tough to tell who is a troll and who really believes this stuff. "The Flat Earth Society" is as ridiculous as a "Moon is Made of Green Cheese" society. Yeah ok, there is a infinitesimal chance it's true, & we've been fed a vast web of lies, but it's so unlikely & defies common sense that it's really just silly.
Then, there is a whole new level of craziness people take their theories to, whether or not it's something they truly believe or are making a joke.
I saw this funny approach to out-doing conspiracy theorists using the Moon, & the comments led me to the amazing image at the top of this post. The 'flat earth' theory seems plausible compared to that configuration. It illustrates the absurd notion that the Universe & the cosmos are actually inside the Earth.
It's a hysterically bizarre & unlikely view of the world. I refuse to accept that someone could actually believe that reality is organized as depicted in that image. It has to be a joke, right???
Oh, I guess not...
Flat Earth Must Decrease, LSC Concave Earth Must Increase
However, the same the question arises in this model, as in the accepted scientific view of the Universe- What is 'outside' of the boundaries? The image at top depicts a hard boundary between the crust of the earth and... blackness? In actuality, the idea of cosmic boundaries may not even apply. I think the Universe is a fractal pattern, infinitely self-enclosed with no discernible edge. Our brain cannot formulate the idea of something without edges or definition.
That is why people come up with simple explanations of the way the world works- because the truth is so complex & unimaginable that the mind is powerless to truly envision it all.