The world as it is...and what goes on in these threads...
If you take the following image and show it to anyone, and ask them to point at the darker gray image, they will point at the top of the object.
Meanwhile, along comes a scientist or engineer and tells you you are wrong, the top part is not darker. He puts his finger across the seam in the middle and shows you that you are wrong.
He then declares that your statement that the top part is darker is invalid. But is it invalid just because it is perception rather than reality?
If I were to put a link on the top of the image and put it online, telling you that I will give you a reduced price on something I am selling if you hit the darker link, and pay full price if you hit the lighter link, am I misleading you? No, because people would choose the right link, because their perception is real and valid. Reality does not trump perception except in limited cases, like perceiving a train coming at you vs. a real train coming at you.
This illustrates where I think the discord in these threads come from. Someone is conveying a perception that is real and valid. Someone else comes along and says the perception is not reality, and therefore the person conveying the perception is trying to mislead you.
In case you think this is an isolated example, it isn't. We do not see the world as it really is, we see it as our brains interpret it. And perceptions have as much validity in many cases as reality.