This is a vent on the side of a railroad car I photographed a very long time ago, probably at the Portola Railroad Museum in California. I added a few rivets and a big "3." And so today's "3" assignment has been fulfilled.
Am I ready for all this to be over? Oh, yeah. But I have to say, it's been good for me to always have this on my mind, and it's a good exercise for thinking about how to create additional images. No self-assignment is ever wasted.