Anyone who lives in their own world is crazy. 

Like schizophrenics, psychopaths, maniacs. 

people who are different from others.

On the other hand,

you have Einstein, saying that there was no time or space, just a combination of the two. 

Or Columbus, insisting that on the other side of the world lay not an abyss but a continent. 

Or Edmund Hillary, convinced that a man could reach the top of Everest. 

Or the Beatles, who created an entirely different sort of music and dressed like people from another time.

 Those people--

and thousands of others--

all lived in their own world.