The relationship shared between the artist and the art is one that is more complex than any other people engage in. While this might seem weired, if you think about it, it makes perfect sense (at least to me). Most relationships are simple (even if we pretend they are not), a culmination of feelings, emotions, thoughts, etc. bouncing off 2 or more people. They become complex because of the communicational link (verbal misunderstandings, body language, and others) that we use to express them; so in essence, it is not the relationship that is complex it is the communication of that relationship.

But with art... well with art there is no communication link, that middleman has been banished and all that is left is the relationship. The true representation of the artist whether he/she likes it or not. A true, undistorted reflection of his/her feelings, emotions, thoughts, etc. at that time (that is why the art always makes sense to the artist even if they don't understand it).