Art - Is it in the Eye of the Beholder?

There are many incredibly talented people out there.  It truly blows me away at the pure talent and creativity that lives in the hearts of others.  It begs the question though, what is art?

Have you heard about Phil Hansen, a gifted artist that incorporates both his work and performance. Here is a short video on him.  His passion for his work is astounding..



How about that piece where he used his own blood?

And what about this guy (Scott Wade) who uses dirty vehicles as his canvas?



Or how about Joshua Allen Harris' Inflatable street art, as seen here:



Or what about art that is created from shadows?



Is art merely the oil paintings hanging on the gallery walls, or does it encompass farther reaching attitudes and philosophies?

Is art truly in the eye of the beholder?

What do you think?