"When, eighteen months ago, Twitcher acquired a computer, I had no idea of its awesome power to transcend reality and create a parallel universe. It was first brought home to me when I was asked to edit a CD-ROM about wildlife gardens, into which a few bugs had inadvertently crept. The designers had decided to link each species to its main enemies, as well as to its favourite food. Unfortunately, they seem to have let the computer do most of the choosing."