Featured on PDR in the essay Fear and Fragility: The Glass Delusion and Its History

In early modern Europe, around the time when lenses began to bring the world (and heavens) into newfound focus, patients started appearing in medical records with a particular ailment: a firm belief that they were made of glass. Tamara Sanderson investigates the source and manifestation of this delusion, and finds a psychological idiom that once carried the weight of what could otherwise not be said.