Wide Screen World:
Art is whatever the artist says it is, but it can also be whatever the observer says it is, and if the observer says it loudly enough, other people can and often will fall in line. Think of Charlotte's Web: Charlotte made people believe Wilbur was special, even when he wasn't. How? By proclaiming it in a public venue as often as possible. I think Thierry's venture into street art has a similar theme. This may not be a new idea - Warhol conclusively proved this decades ago - but it makes for an interesting narrative.