I have never believed that art should follow any rules.
An artist who follows rules and not his heart is not an artist,
but rather, a craftsman.
If I do not understand the Mona Lisa, it does not cease to be art,
it just means that I do not understand it well enough to see the beauty.
If your teacher did not understand "Seventeen Years of My Life"
that does not mean it is not art, it just means he saw it through
the rules that he had for what art is or isn't.