Right now I have two guitars in pieces on my bench... Two bike projects going and one in my head... and another hobby that I shelved for a couple of years (model railroading) that I've been thinking about revisiting. In my head some things are never finished because they are an ongoing process. The artsier it is, the more likely I am to continue to modify, rebuild and personalize. A model railroad scene is never done, you can always continue to super detail it adding to the realism. As new ideas are discovered I continue to modify my guitars to add to their functionality and often just to get that look. Bicycles are the same, there is function, and can I bend it to fit my wants... and there is form which I need to personalize, or else it's just a bike. As I travel thru life my ideals change and so do the things around me, so they are never done. That or I'm just full of baloney...