Tell flat-earthers that the earth is flat, but wrapped around so that when you leave one edge of the map you re-enter on the other side - like Pac Man but in every direction. And thus the flat earth only looks spherical but is in fact a hollow ball made from a flat sheet.
Then watch to see if they switch to being hollow-earthers instead lol
thats downright boring next to some of the models they come up with.
there is a model with a hollow/torus earth,
were the sun is on the inside, while we are on the outside.
the sun dips up and down anlong the poles and leaves through the gigant holes in the arctic&antarctic (that nasa covers up)
which causes the daylight cycle.
and the sun moving throughout the sky is just an illusion caused by atmospheric lensing
flat earthers are only unified by the belief that the globe model is fake.
they all pick and choose which models they like, based on what conspiracy theories they subscribe to, and what "evidence" they believe in.
for example the model i described fits in well with hollow earth conspiracies like annunaki or lizzard people and "nasa hides the poles to cover up the truth"
and when they are confronted with evidence that disproves one of their models its suddenly a strawman that no real flat earther believes in.
and they pull out a different model that is entirely designed around addressing that one issue. (rinse and repeat if you disprove the next model)
I think it is more of a tiling block system so as you move the edge of the map it the blocks detach from the far side and move in front of you before you reach the edge.