A1_56668_2500 
I like the idea of making a perfectly mundane object just a little different. You cannot get much more mundane than a manhole cover, and a great many of them are quite boring. Whoever designed this one decided it could be a bit distinctive without losing any of its functionality. That appeals to me.
This images was shot with the Voigtländer APO Lanthar 50mm f/2 lens on a Sony A1, at f/8 1/200 ISO 250 using manual focus. The image is cropped.