gas

Here are 4 photos I’ve taken on different days in recent years.

I realized in posting these photos that I’m not entirely sure what to call the things in the photos. They are not unlike manhole covers, but the holes that they cover are not man-sized. They are significantly smaller, perhaps 8 or 10 inches in diameter. Definitely too small to fit a man. Perhaps a slender gnome could fit, in which case they could be gnomehole covers.