Staples begins his essay by discussing the effect of his presence on another person. However, others’ reactions to his presence affect him in return, and he spends much of the essay explaining the emotional and practical effects he experiences as a consequence of his interactions. How is the complication and paradox of these situations expressed by the last sentence about Staples’ whistling classical music being the “equivalent of the cowbell that hikers wear when they know they are in bear country” (paragraph 12)?