POTD: The Big Oh

The Big Oh
Bozeman, Montana

On my walk during a recent spring snowstorm the heat from a sewer hole cover¬† formed and interesting circular shape. (I originally called it a sexist name–manhole cover–because that’s what I learned back in the dark ages. But somewhere along the line of progressing towards gender equality this name, like many other, got changed. After all why should men have all the fun accessing sewers.)