In the year 1760, a Swiss naturalist named Charles Bonnet became concerned when his grandfather Charles Lullin began to experience a parade of “amusing and magical visions.” The eighty-nine-year-old Lullin was being visited by visions of people, birds, carriages, and buildings, all of which were invisible to everyone but him. Apparently these mysterious objects materialized spontaneously among the few bits of the world he was still able to perceive through his cataracts.