I think quite a lot of our 'perception' depends on the perspective we receive.

If we are the inquisitive type, we sift through what we are told, and use our experience and common-sense to draw our conclusions.

If you are like Wolfgang, you play the devil's advocate.
You need neither common-sense, nor experience for this, and as Tír Eoghain so eloquently put it, elswhere on these threads "It's like telling somone you see a blue hippopotamus sitting in the corner of your room, and requiring your interlocutor to prove to you that it isn't there" (sic)

Hate to be a pedant, Wolfgang, but: How, how, how, how, and how, as concerns you first paragraph in your 04:10 PM post?