Jerry Gretzinger is a mixed-media map-artist that I've been following for about 13 years. He's been working on the same piece for sixty years! (sort of...)
In the summer of 1963 Jerry began drawing a map of an imaginary city. The work started as a doodle done in the spare time he had while working at a tedious job. He continued to add to that map through the years until, in 1983, he set it aside to put his free time to other use.
So then
it sat in the attic for twenty years and he picked the project up again and has been going at it ever since.
[ulr=https://www.jerrysmap.com/process]He uses a custom deck of cards to tell him what to do[/url] to the map each "turn", so it's sort of analog-procedural art that evolves over time.
https://www.jerrysmap.com/
He posts regular imagery from the project to
Reddit and
Facebook, at least.
And he sells artifacts (original panels, cards, etc) from the map at his
Etsy store (he used to use eBay too), but there hasn't been anything there for a couple of weeks, so I'm not sure if he's on vacation or he's stopped or what.