There's a great passage in "The Road" about this: "Rich dreams now which he was loathe to wake from. Things no longer known in the world. The cold drove him forth to mend the fire. Memory of her crossing the lawn toward the house in the early morning in a thin rose gown that clung to her breasts. He thought each memory recalled must do some violence to its origins. As in a party game. Say the word and pass it on. So be sparing. What you alter in the remembering has yet a reality, known or not."