I like this test: Could I, with no expertise, talent, training or skill, have produced what I am looking at? If the answer is 'yes' then I do not consider it to be art.
I also like this story (urban fiction?) concerning the assessment of art by experts:
An artist's work of a sculptured head was offered to the Royal Academy for their summer exhibition and he was notified that it had been accepted. Needing to be displayed in a particular way it had therefore been dispatched with a display cradle not unlike a stylised dumbbell. At the exhibition our artist was somewhat surprised to find that it was the cradle on display because the judges mistakenly thought that two items had been submitted and they therefore chose the best and rejected the other. Maybe they were right ................