|Gas test cover|
This natural gas test cover has a serif font for the GAS and a sans serif font for the TEST. The use of the two didifferent fonts and the addition of wing dings demonstrates the thought and consideration that went into the layout of the cover.
|Black hole formation|
The formation of a black hole in close proximity to a light shimmered sewer cover illustrates a common physical phenomenon.
|Worn down sewer cover|
This worn down sewer cover is being closely monitored. It will be replaced when a hole has been worn through.