Monadnock A time-lapse film tracks the evolution of a city over a period of a hundred years, revealing the fact that the urban fabric consists of elements that alter at different rates. The buildings change very slowly. They form static structures that are able to survive several eras, uses and trends. Buildings are slow and constitute the solid material of the city. Similar to a Monadnock, the type of mountain that is formed by the disappearance of all the surrounding material through a long process of erosion. Only the hardest rock remains.