Since 1963 Jerry Gretzinger has been painting a map of an imaginary world. From the video the process of his map creation seems also to be partly an elaborate game of solitaire. He picks cards from a deck that control which segment of the map to redraw, revise or remove. He describes his map as a perpetual and ever evolving painting.
He also runs a blog Jerry's Map where he discusses his map. He also sells panels from it on E-Bay. Although a strange obsession, I find it a quite interesting concept. I'm of half a mind to bid on one of his panels.