Some of the best art is open-ended - you can read into it many different things. When it is too clear, too polished, too complete, it tends to be cold, in my opinion, in that it says - job done, and you the viewer, have nothing to contribute here. On the other hand, pictures that are both interesting and ambiguous, are much easier to emphatize with, as they invite you, the viewer, to add their viewpoints and interpretations. I used to dislike abstract art, until my wife (who's a trained artist) gently reminded me that for art to be effective, it has to involve the viewer. Do we want to have a story told to us, or do we want to participate in creating the story? Of course, there is also the phenomenon of blathering on when there's really nothing there... (the allegory of the "emperor's clothes" comes to mind), but the razor there is emotion - if none is evoked, then the words ring hollow.
@ mishele: so how do flowers look under black light? Hmmm... might have to try this.