I wanted to ask this question for a long time but couldnt find any thing to support my argument. Today i found this https://www.ted.com/talk/anil_seth_how_your_brain_hallucinates_your_conscious_reality#t-694887, where the speaker Anil seth theoretize that our reality is just a hallucination. Exchange of information happens both ways inside and outside, i.e, we not only perceive the world around us but also actively generates it.
Perception is an active constructive process. To summarise,
Hallucination is uncontrolled perception, then Perception is controlled hallucination.
My question is, If thats the case then how two people would agree on the same state of world?