What to you is a "perspective"? Can you give me an example?
I suspect we may not be talking about the same things since I think it is
painfully obvious that we each have a "perspective", at least in terms of what
I means by the word "perspective".
When any sense information of any kind enters our body - the sounds that comprise words, the light reflected from objects - we
necessarily and unconsciously (for the most part)
interpret that "raw data". Example: You see a dog on the street. What is the raw data that enters your eyes? It is quite simply an array of "pixels" of light,
nothing more. So when you conclude "that's a dog", this is because your brain has done lot of complex interpretations. Otherwise, you could not make sense of the image at all. And
your particular knowledge and experience will shape
your interpretation. Some will react with "I want to pet that dog" while others will recoil in fear.
Perhaps of more relevance to this thread consider two people, A and B, who see a "vision" of a dead relative. Person A who comes to this experience believing in ghost may well think he is really seeing that person. Person B, a hardcore "nobody here but us atoms" kind of guy, will conclude this is an hallucination and the ghost is not "real" in the "it's really out there in the world" kind of way. Two different "perspectives" on the same raw information.
It is in this sense that I claim no one can claim direct (objective) knowledge of the world - everything we know is generated by the action of a complex set of presumed beliefs about the world as applied to the raw sense data that enters our bodies.