Is it not an undeniable truth that our planet Earth is round?
Well, you are relying on something that was abstract when it was created and basically made-up. The guy who created the name 'round' was referring to something with the shape of a circle. But if what we know as 'square' would have been named 'round' and what we know as 'round' would have been named 'square' ... then the earth would be square.
Or it's possible that the earth is really a 439,239,299,197-sided triangle and since humans cannot perceive a 439,239,299,197-sided triangle, we perceive Earth to be an oblong sphere.
Imagine trying to convince someone who is
severely colorblind what blue or red looks like. You can show that person every shade of blue or red under the sun, hundreds of scientists can test the person, yet still the man cannot perceive blue or red no matter what you do.
Did you know that a culture has to have knowledge of linear perspective in painting in order for a child in that culture to see linear perspective painting as we do? If you take someone from a cultures without linear perspective painting, one will not interpret a linear perspective painting to be accurate. In order to see linear perspective, you have to have it around you. It's not something everyone interprets the same way.
Because of the near ubiquity of western-style art, most people in the world interpret
this picture to be of long hallway. People isolated from the west would look at this picture and find it nonsensical.
Supposedly there are 11 dimensions to the universe yet, for whatever reason, we can only detect four of them (height, width, depth, and time). We seem to have evidence that these dimensions are there because mathematics and physics, in the latest theories, tell us these dimensions are there. We're essentially just like the colorblind person in the respect that we're limited in our perceptions. Even if we know those other dimensions are there, how do we conceive of them?
Think about this, if we're missing 7 of 11 dimensions, what else are we missing?