You think you know about the world, but nobody really does. All anyone knows is what they have chosen to focus on. The field is too large, to varied, too entwined with itself and everything that passes through its lenses. Seeing isn't enough, hearing, smelling, touching, not to mention the more amorphous senses like trust, and the murky confusions of certainty and proofs. Change your aim just a little and the entire picture changes, demands the same level of skepticism and trust, and never achieves either.
And this is just talking about this planet, this existence. How do you factor in the rest of the Universe? It does matter - we are of, in, around, and through it, so how do we not include that in the entirety of understanding? Hell, most of us can't even explain our hometowns, our neighborhoods, our families - ourselves! Some event happens, someone explains it to us, and we are expected to take it on face value, unless we are a bit healthier than that, and then we might buy in after two or three other "views". But whenever it is we get to buy-in on some small part of the world's doings, once we sign off on the information, we almost hard-wire it into our confused little squishy convoluted brain twistings and then it's off to the races, Al!
When all the time, the only truth about the whole thing is - as the Buddha already informed us - it's all illusion. All the time.