There is a particular rusty metal thing embedded in a slab of concrete at the side of a road. I’ve seen this thing in passing many times, and often thought, “Hey, I should go take a picture of that thing, or at least find out what it is.” Today I have, at least, accomplished part of that idea.
As for what it is, or was, taking a closer look brings me no closer to understanding. Some sort of valve? Part of a pump?
Or a robot, buried up to its neck in concrete?