The teacher and her students brainstorm a list of talents, skills, and specialized knowledge belonging to members of the class. Some of the items on the list include how to make a soufflé, how to juggle, and how to teach a dog to do tricks. One student knows a great deal about spiders and another about motorcycles. She asks each student to write an essay about something he or she is good at or knows a great deal about. What kind of essay is she asking the students to produce?