" Mr Ambrayses nodded. “Two explanations are commonly offered for this,” he said:

“In the first we are asked to imagine certain sites in the world–a crack in the concrete in Chicago or New Delhi, a twist in the air in an empty suburb of Prague, a clotted milk bottle on a Bradford tip–from which all flies issue in a constant stream, a smoke exhaled from some fundamental level of things. This is what people are asking–though they do not usually know it–when they say exasperatedly, “Where are all these flies coming from ?” Such locations are like the holes in the side of a new house where insulation has been pumped in: something left over from the constructional phase of the world.

“This is an adequate, even an appealing model of the process. But it is not modern; and I prefer the alternative, in which it is assumed that as Viriconium grinds past us, dragging its enormous bulk against the bulk of the world, the energy generated is expressed in the form of these insects, which are like the sparks shooting from between two flywheels that have momentarily brushed each other. "

― M. John Harrison