"Kleinzeit" is a philosophical and psychological novel by the Austrian writer Leo Peruzzi. The book tells the story of the study of the human psyche through experiments with patients of the psychiatric hospital "Kleinzeit". The main character, Dr. Bernhard, encounters extraordinary phenomena that go beyond the traditional understanding of the future, past and present. The discoveries he makes in these studies destroy the usual ideas about time and space, and are also designed to rethink the concepts of reality and existence. "Kleinzeit" is a book that invites the reader to think about the deep aspects of human nature and our perception of the world.