Prétextat Tach is a fictional character from the novel "The Invention of Morel" by Adolfo Bioy Casares. He is depicted as a mysterious and enigmatic figure who plays a significant role in the story's exploration of themes such as love, obsession, and the nature of reality. In the narrative, Prétextat Tach is associated with a strange machine that can capture and replay moments from the past. This invention raises questions about memory and existence, making him a pivotal character in the philosophical discussions presented in the book.