 Character weaknesses and faults, such as tardiness, cowardice, or vice, may leave the narrator unintentionally absent or unreliable for certain key events.Specific events may further be colored or obscured by a narrator's background, since non-omniscient characters must by definition be laypersons and foreigners to some circles, and limitations such as poor eyesight and illiteracy may also leave important blanks.Another consideration is how much time has elapsed between when the character experienced the events of the story and when they decided to tell them.