Reality is what you perceive it to be.  Every person's reality is different.  The mentally ill are only ill in the sense they perceive reality in a way different from what we do.  Insanity is a minority of one!

Common reality would be the group consensus on perception.  For instance, person sees a flying saucer hovering over New York City.  9 million others do not.  The common reality is that there is no flying saucer.  For that 1 guy though, there sure as hell is.  Which is reality?  Does the group perception dictate reality?  In most cases, sure, but I think it's fallacy to always accept that.  

Then there are the people with sollipsism who think that everything is a creation of their mind and that when something is outside of their perception, it ceases to exist until perceived again.  I know someone who really thinks like that...truly bizarre.



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