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While details of Oprah 's family tree may interest her more than they interest the average viewer , the producers skillfully illustrate how the lives of her ancestors represent larger truths in the black and slave experience . Cognitive Scientists have seized on this insight to introduce discrete structures that underpin computational explanations of human cognitive capacities - like Chomsky 's parse trees that can represent syntactic judgments about natural language structures or Marr 's visual scene descriptions that characterize the visual world . Scarborough 's fruit trees , an apple orchard planted by Frank Davis , and other fields of peaches , pears , and berries established the area as one of the pioneer fruit-raising centers of North Texas .