This pattern has been repeated for years at many college campuses in the U. S., France, and Germany. No explanation has been found for why the thing is staged or who is behind it. If it’s a work of performance art, nobody has ever taken credit. An unidentified person wearing a straw hat and rubber boots appears in various classrooms. This man or woman says nothing and does nothing, except to take copious notes. The stranger doesn’t always wear a straw hat and rubber boots, but there’s always something odd about his or her appearance. He or she shows up for days in different classrooms, and the first time he or she is questioned leaves abruptly and doesn’t return.