Truths like 1+2=3 is pretty easy to agree on, but when we consider all particles on universe, all types of systems and people connect, it gets increasingly intractable for our mind to get the whole truth.

It's like trying to project a 3D globe into 2D: I'd you choose preserving correct distances, you distort angles. If you preserve angles you distort distances.

Another example: a cylinder is 3D, but seen by a 2D mind will be perceived as a rectangle or as a circle depending on the angle it observes.