I have four criteria for what I consider to be great art. They have seldom led me wrong.
- It must be a work of great craft. If the artist cannot manipulate the medium to intended effect, it is not great art.
- It must be entirely original. Good retreads are not great art.
- It must forever change the way the viewer experiences the world. Great art opens up one's perceptions to new ideas and ways of "seeing."
- It must teach something new or appear different every time you interact with it.
This set of criteria obviously disqualify the vast bulk of what we see as "modern art," but is in no way restrictive. As you will see in this link,
this qualifies as great art.