This volume treats the topic of rationality developing a perspective that integrates elements of philosophy of language, phenomenology, pragmatism, and philosophy of life. The two reference authors, Wittgenstein and Ortega, are contemporaries but come from different philosophical traditions. Wittgenstein's early work was influenced by logical positivism. Later he developed an influential approach to philosophy of language. Ortega was influenced by Neo-Kantianism, perspectivism, life philosophy, and phenomenology. On this basis, he developed an independent approach that has become known as ratiovitalism. Astonishing affinities between their respective reflections on rationality motivated the experiment of bringing the different approaches into a synergetic relation. Both investigate the structures and limits of rationality, emphasize the importance of basic beliefs, and criticize the restriction of rationality concepts to the intellectual sphere. The contributions of the volume focus on: dynamics of belief and knowledge, implicit and explicit knowledge, the concept of "vital reason", the role of world-pictures and forms of life, questions regarding certainty, ignorance, doubt, and madness, as well as matters of pluralism and relativism.

There is at present no publication specifically dedicated to analyzing the philosophical implications of augmented reality, especially regarding knowledge formation, which constitutes a fundamental trait of knowledge society. That is why this volume includes an analysis of the applications and implications of augmented reality. While applications cover diverse fields like psychopathology and education, implications concern issues as diverse as negative knowledge, group cognition, the internet of things, and ontological issues, among others. In this way, it is intended not only to generate answers, but also, to draw attention to new problems that arise with the diffusion of augmented reality. In order to contemplate these problems from diverse perspectives, the auhors are from a variety of fields - philosophy, computer sciencess, education, psychology, and many more. Accordingly, the volume offers varied and interesting contributions which are of interest to professionals from multiple disciplines.