I've found a decent explanation:
"Art is by definition something that has been created with intention; it can be a story, performance, design, sensation, picture, object or relationship. It can also be a number of these things layered on top of and interacting with one another. Art pays attention to emotional aesthetics but can look like anything, using a myriad of methods, media and forms to achieve its desired effect. When it is interesting and valuable, it has the power to engage creative faculties and inspire the focused thought and attention of those who experience it as creators, critics, or readers. When it is boring, it replicates dominant cultural forms and conforms to expectations about what is defined as beautiful."
Slingshot! Current Issue
So, do you agree with this or disagree? I think an interesting discussion could be had.