Those living in a city assimilate several levels of urban space. The sky, the uppermost level, is often obscured. It is an unessential part of a cramped cityscape. The role of the vault of heaven in a flat image is occupied by other forms. And the sky, forced out of volume, mimics. It becomes just one of the textures of urban fabric. But at the junction of the sky and walls characteristic kinks are born. This is the roof line. Recognizable, it repeats itself at multiple levels. Those are the roofs that are drawing the skyline of a city. And this is the sky we have.