Behold the Camden Bench. This pale, amorphous lump of sculpted concrete is designed to resist almost everything in a city that it might come into contact with. Named for the London authority that commissioned it, the Camden Bench has a special coating which makes it impervious to graffiti and vandalism. The squat, featureless surface gives drug dealers nowhere to hide their secret caches. The angled sides repel skateboarders and flyposters, litter and rain. The cambered top throws off rough sleepers. In fact, it is specially crafted to make sure that it is not used as anything except a bench. This makes it a strange artifact, defined far more by what it is not than what it is. The Camden Bench is a concerted effort to create a non-object.
As such, the Camden Bench is a strange kind of architectural null point. A piece of the city that by design will not interact with it in any way. It is a bench by the slimmest of margins -- hardly comfortable, affording none of the qualities that would make it more than simply a place to sit. This is the bench's sole concession to being part of the city, and it does it with the least conviction possible.
I'd like to see what the Camden Bench would look like if it didn't have to be a bench -- if that final design constraint was removed, what would it become? Just some nebulous lump of concrete? Would it shrink or grow? Would it even be visible, or would it exist as a space hidden behind a physical wrinkle in the map? The Camden non-Bench would be like a hard pearl in the mouth of an oyster, of the city but not part of the city, just an inert lump.
See also Unpleasant Design.