concrete reality is something that is percieved by 5 senses. by more than 1 person. because sometimes schitzophrenia distorts reality of 1 man. so it has to be percieved by more than 1 man.
philosophically speaking. reality is what you do about percieving things using 5 senses. (we call this experiences)
reality as it is now can only be described in a consensus type form, all people would need to be asked a controlled question, then plot on a graph (an extremely large one mind you) and a line of best fit drawn,
NOW I KNOW this wouldnt be an exact reality because more and less would be added and subtracted, however this would be the most comfortable because it would present a concrete conclusion for people to base their beliefs off of.
this in turn would cease to be reality in a mere second because life would be introduced into the world as the chart was completed, thusfully ruling out the reality that all were looking at, and therefore there would be no reality
reality= a time sink for the mind to wrap itself into