Geograph - photograph every grid square

Totally boring image of the standard (plastic) water meter access cover as installed by Thames Water. Uploaded to compare and contrast with X2693 : Celtic art is still flowing - close-up the splendid way they do it in Ireland.

To make this page a bit more interesting here are some factoids from Link (Archive Link ) on Wikipedia:

Q. Why are man hole covers round?
A1. A circle is easier to manufacture.
A2. Cannot have situations, like with a square lid, where the lid falls into the hole because the edge is smaller than the diagonal.
A3. Can be locked in place by doing a quarter turn.

(The system does not seem to support a view direction of looking vertically down!)