Here is something vaguely architectural. This is a device that rotates and sorts bucket loads from an excavator in a gravel pit. What emerges is various piles from rocks to gravel. There is an old engine in the back that runs the whole thing. Tires rotate against tires to turn the sloped cylinder and as gravel tumbles though it the finest gravel falls out into a pile in front, small rocks to the left and big rocks out the end. Very homemade and very cool. It should be in the Smithsonian. I worked for the man who built this when I was in high school in Maine. I think we all know someone like him, able to make or fix anything.