Sinkhole urban areas due to water main breaks or sewer collapses when old pipes give way. They can also occur from the overpumping and extraction of groundwater and subsurface fluids. Sinkholes can also form when natural water-drainage patterns are changed and new water-diversion systems are developed. Some sinkholes form when the land surface is changed, such as when industrial and runoff-storage ponds are created; the substantial weight of the new material can trigger a collapse of the roof of an existing void or cavity in the subsurface, resulting in development of a sinkhole. Sinkholes tend to occur in karst landscapes. Karst
A Void its author an opportunity to display his customary virtuosity as an avant-gardist magician, acrobat and clown." Both of Georges Perec's parents perished in World War II, his father as a soldier and his mother in the Holocaust. He was brought up by his aunt and uncle after surviving the war. Warren Motte interprets the absence of the letter E in the book as a metaphor for Perec's own sense of loss and incompleteness: In French, the phrase "sans e" ("without e") sounds very much like "sans eux" ("without them"), another encrypted reference to loss. A Void A Void, translated from