When does something stop being art? Or fail to become so?

When does something stop being art? Or fail to become so?

If you go to the Gallery of Modern Art,you will wonder how does people view empty canvases,or just two canvas display together,one is colored black and other one is white,called an art??and who the heck has the right to declare that a certain piece is considered an art?even if its just a piece of slab?certainly there must be somebody out there who will opposed..but then,you will see all this in the famouse gallery of modern art...so where does it leads??where does it stops?.where does it ends?..

Art is a language and the words in it are visual images. Art is supposed to give us a different view of the things we experience. I think it fails when you look at it and there's nothing to it but the simple image or the language is gibberish to you. That's why there's a problem with modern art. Most people on earth feels it's gibberish.

if you believe in your dreams...you ll never fall