It seems to me it is sometimes impossible to do that, or else it means willfully ignoring the relevant context of a particular work. I am not an art expert, but can we look at, say, Breton or Rimbaud without understanding the socio-political context in which it was made? Isn't that what gives it any significance at all? Some art may transcend whatever movement it was a part of, but in many cases, it seems to me, it is the school that gives it significance. Now, significance and beauty are two different things.
I am afraid I one of those who denies art has any meaning other than beauty.
"Significance" is nothing but agitprop, advertising, commercial or political graphics. I won't call that art.
So9