Facts are only factual to those who beleive the facts to be valid.
If it is beleived that the world is flat when it is not, then it is a fact to everyone who beleives it and not to those who don't. This does not mean the world really is flat, it only means that the majority of people accept the world to be flat.
How about: You see you have one couch. Is the couch really there or just in your head? If a majority says the couch is there does it mean it is? A majority could be classified as inconsistent with the minority. So, Facts=Opinion; Facts are paradoxical.
I can safely say that the world is round, and that it is a fact, because all of us here agree that this is a valid statement. We all perceive it as fact, and therefore it is a (commonly accepted) fact.
The Sun is not a ball of gas, but a ball of plasma. Let us pretend, for the sake of argument, that everyone here finds this to be a vailid statement. It would then become a fact that the Sun is a ball of plasma. Obviously, if the sun actually is a ball of gas, we are wrong, but it would still remain a (commonly accepted) fact. However, I am certain that you will find people who still think the sun is a ball of gas. So what is fact is only fact to those who beleive it to be true.
On the flip side, I can be schizophrenic and say that there's a dolphin living in my couch. To me, this would be a fact, even if it's not true. I could also say that there was a crab living in my pillow (which could-for sake of argument-be true), but nobody could beleive me. Therefore, it would still remain a fact only to me, and to everyone else I would be wrong.
Nothing is true, everything is permitted.
Fact is a truth. Truth is actuality.
Actuality falls into two catagories,
what truly is, and
what is perceived. Everything we think and know is perceived, nothing is known without perception, therefore actuallity through
what is perceived may differ from actuallity that
truly is. There is no absolute way to know if what truly is matches up with what we perceive. Therefore, fact really means:
Fact is a truth. Truth is perception.
Nothing is true, everything is permitted.
In short, this means that nothing is absolute. We all may accept that the sun is a ball of plasma, when in actuallity (that truly is), it could be a gas; it could be a plasma, but because there is no way of actually knowing what truly is, but only what is perceived, it is not absolutely true. Let me use Assassin's Creed as an example. What everyone sees to be a priest may actually be a priest, but there's no certainty that it really is a priest. If it truly is a priest, it may be true, but there's no way for anybody to actually KNOW, only to perceive that it's a priest; because what everyone perceives as a priest could really be a deadly assassin. This is why the phrase is used in Assassin's Creed
However, there's no point in rejecting what we perceive, because it is impossible not to perceive as it is also impossible to go beyond perception such as magically "knowing" as if we were God.
Perception is real, because reality is perceived.