This book is a coherent argument about the meaning of the term "postmodern" is it applies to philosophy at the opening of the twenty-first century. The author makes the case that the twentieth-century development of the doctrine of signs, commonly known as semiotics, represents the positive essential thrust giving birth to a postmodern era of philosophy, as clean a break with modern thought as modern thought was with Latin scholasticism in the time of Galileo, Poinsot, and Descartes - but with a difference. Contrary to what the author dismisses as false claims of postmodernity, the work shows that what is truly postmodern in philosophy both goes beyond modernity and recovers philosophy's past in a renewed understanding of the human condition. The "problem of the external world," which modern philosophy began by creating, postmodern philosophy begins by revealing as a quasi-error. The book concludes with a philosophical dialogue revealing the inadequacy to the postmodern situation of a simple return to any past form of "realism."