Just as a philosophical point:   there is only one reality. There are as many ways of peceiving that reality as there are people. The trick is to make your perceptions correspond as closely as possible to that one reality. Some folks are pretty good at it. Generally, they are the ones who look carefully and think deeply. And there are folks who are not. Generally, they are willing to believe what other people tell them without thinking about it very much.

Don Firth