What concept does the term "brainsweeping" relate to in the context of the story?

The term "brainsweeping" in the context of the story refers to a mind control technique used by the antagonist, Mr. Curtain. This concept involves manipulating and controlling the thoughts and actions of individuals as part of a larger scheme to maintain authority and suppress free will. The technique is pivotal to the plot, highlighting themes of intelligence, autonomy, and the dangers of relinquishing control to a higher power. By understanding this term, readers can grasp the significance of the characters’ efforts to resist such control and the overarching conflict between freedom of thought and manipulation in the story.