"We began life as simple floating spheres. As eggs we popped from follicles of mothers-to-be. Fertilised by sperm in fallopian tubes, dividing again and again, our spheres persisted. But when we nestled and flattened into the womb's wall, and, later, groped with arms and kicked with legs, an interplay between the sphere and its contrary began. This interplay forever follows us: by day we walk as upright sticks; at night we curl into fetal balls." Tyler Volk, Metapatterns (Colombia University Press, USA, 1995) page 3.