Harper lee uses the technique of allusion in her book ‘to kill a mockingbird’. An example being the  biblical effect of refering to Atticus as Tom Robinsons savior, elevating him to a christ-like level such as in the bible, as christ is a savior.

Others examples being of how the book alludes to other parts within the story, be it future or past. She even alludes to parts happening in that time period such as world war II.