It was once said that Abstract Art starts from a concrete form and then all traces of it are stripped away. It then forces you to stretch your imagination to recapture that form. In that way Art excersizes your brain. It (the art) also takes you on a journey into your subconscience, forcing you to explore the parts of you rarely visited. This can be joyous or tramatic, depending on what you find there.

As a point to mention, aestetics has a negative side. The deception of perception, I call it. This has to do with the fact that optics all to often differ from operondi.