What is real?

I just watched a fascinating movie: A beautiful mind (SPOILER). The fact that the protagonist suffering schizophrenia makes me wonder: How real is what we live? Who decides what is sanity or insanity? Is everything established real?

In response to the first question, it seems simple to think that something is real if it can be perceived by the senses, but Is unreal what we imagine or develop in our head? Not to me. In my opinion, what we imagine is as real as tangible things. After all, our senses are nerve impulse processed by the brain that turns into images, sounds, smells, textures and flavours in our head. Mathematics, physics, language or love are models of reality that human imagination and reason has developed and they are no less real.

Secondly, throughout history it has been assessed as crazy  everybody who thought eccentrically from the established ideas of the moment. For example, for three centuries  it took for mad who thought that the earth was round and rotated around the sun. Currently we still judge people in the same way without stopping to investigate the thoughts of a "crazy". For a moment I want you to imagine you're in a world of blind people and you're not. How would you explain what is the red colour? Surely you would be the craziest person in the world if you tried.


In conclusion, the human being continues blind with the most used and most damaging tool: Language. Language is a model that describes and grid the reality but, as I can not express perfectly what I mean by the language, I can not define reality neither. 

Good night.