You cannot define electricity. The same can be said of art. It is a kind of inner current in a human being, or something which needs no definition.
Art has the lovely habit of ruining all artistic theories.
Anything is art if an artist says it is.
Unless a picture shocks, it is nothing.
Art is like a shipwreck; it's every man for himself.
Can one make works which are not works of 'art'?