In Miguel de Cervantes' "Don Quijote of La Mancha," the phrase "Of straw and hay..." captures a significant aspect of the protagonist's delusions and perceptions. The quote reflects the contrasts between reality and illusion, showcasing how Don Quijote's idealism often leads him to misunderstand the world around him, including the simple nature of everyday objects. His adventures are often influenced by his misguided interpretation of chivalric tales, which skew his judgment and drive him to act in eccentric ways.

This theme of illusion versus reality runs throughout the novel, as Don Quijote embarks on quests that often highlight the absurdity of his beliefs. The juxtaposition of straw and hay may symbolize the ordinariness of life that Don Quijote fails to recognize in his grand pursuits of knightly glory. Through these explorations, Cervantes delves into the complexities of human aspiration, folly, and the often blurred line between dreams and the mundane, making his work a profound commentary on the nature of reality.