Just as in literature, where memorable characters like Hamlet or Heathcliff or even Dirty Harry stand out and become symbols for a larger segment of humanity, so in marketing can whole target-customer populations become imagined as teenyboppers, yuppies, pickups and gun racks, or the man in the gray flannel suit. These are all just images—stand-ins for a greater reality—picked out from a much larger set of candidate images on the grounds that they really click with the sum total of an informed person's experience. These were, in short, the memorable ones.

p. 67 - Crossing the Chasm, 1991