"The basic idea behind the possibles theory was simple, and didn't provoke much dispute. It went something like this. Since each of us was copied at some point from a normal person, there must be, for each of us, somewhere out there, a model getting on with his or her life. This meant, at least in
theory, you'd be able to find the person you were modelled from. That's why, when you were out there yourself–in the towns, shopping centres, transport cafés–you kept an eye out for “possibles”–the people who might have been the models for you and your friends."