A bit of an unexplained phenomenon in the sunny streets of Aberdeen. Their unusual "street font" tiling system bares witness to some peculiar geological activity. Either a road that is slowing rising or one on which ground level is sinking. Perhaps there's just slow moving pavement quicksand sucking things under. Something I've not heard about either.
In an area of rock solid granite and tradition values of construction it's hard to understand. Locals are up in arms (not really) and engineers and experts remain pleasantly baffled. There is no clear answer but there is no clear danger ... as the pavement sinks slowly in the North East whilst the mighty tectontic plates adjust themselves.