The Goal of Art with regards to the side question I basically agree with OOO and Graham Harman here... Work of art is "something" just like this galaxy, Ford Motor Company, Emperor Penguin, or lyrics of Lady GaGa song.
With regards to the goal of art we must look at particular and at universal here. So a single work of art can have a very specific goal in mind, it can be made for profit, or for display, or whatever the goal that the artist states it is.
Now in universal terms it is much broader, but singularly not alien to our phenomenological receipt of it. For instance one may argue that a goal of medicine is to heal broken bodies in particular, but in universal terms that may mean to change human nature by extending life beyond its natural boundaries. Therefore, in particular art is to be looked at, but in universal terms art is to be seen in a manner that escapes particular approach. Thus looking at Statue of David particularly, is a vista of human creativity in universal terms... That creativity we expirience as extraordinary and we ( not all of us as I am not a fan of modern art ) expirience as art.
Needless to say, various iterations of blue or red squares in my mind never move ones mind beyond the particular. Thus making it am common place expirience of blue colour.