I own a stone tool with representational carvings that would have been incredibly valuable to scientists had my great-grandfather not uncovered it by sluicing d

I own a stone tool with representational carvings that would have been incredibly valuable to scientists had my great-grandfather not uncovered it by sluicing down a mountainside looking for artifacts. It's the only known example of a minor art style in a specific location, and it's completely worthless because some dude pulled it out of the ground and put it in a box.