What is Real?

How do we know

that what we see

is not the figment

of someone's imagination?

That what we call

real

is not a dream

or in

the edge

of consciousness
of a person?

That what we dream

is a fake, 

made up world

from our subconscious

and not the other way

around?

Perhaps the world

we always thought as 

twisted and impossible

is actually normal

and the world

we consider

authentic 

is the

insane

one?

I just watched the movie "Inception" and it totally messed with my mind. I was left with so many questions about what was real and what was a dream that someone created. What was the thing that we called "reality" and what was "fake" or "untrue".

What if someone did find out that the world we consider "real" is actually all a dream, and the crazy, impossible world of our subconscious and imagination is reality?