Schizophrenia is one of the most terrifying diagnoses a family can learn about, and notoriously hard to characterize in terms of its inner experience. In this book, the author goes back to the seminal case of Daniel Schreber (d. 1911), a very articulate schizophrenic whose memoirs served as a foundation for Eugen Beuler's characterization of schizophrenia (dementia praecox) as well as for Freud's psychoanalytic theories.
The author invokes the writings of 20th century philosopher Ludwig Witgenstein, who himself may have struggled with the dangers of madness that comes from intellectualizing alone, cut off from concrete social life around him. The author suggests that much of the inner experience of self-dissocation, and confusion of subjective and objective dimensions, and bizarre magical thoughts, can be characterized by analogy to a philosophical position that Wittgenstein characterized in different ways as solipsism, or as private language - both of which Wittgenstein argued threatened to dissolve into incoherence.
In a sense, the author proposes, this dangerous territory of solipsistic dissolution is exactly where the schizophrenic goes, cut off from practical life. Yet, the "smile" of the schizophrenic tends to show an ironic awareness of the difference in order of "reality" between imagination and material facts.
This is a very different take from, on the one one hand, more taxonomical approaches to schizophrenia (for example in the DSM-IV), and on the other hand, more romantic approaches that characterize madness as a sort of Dionysian attempt to return to mystical, pre-linguistic childhood. Instead, the author argues that schizophrenia -- which emerges only after adolescence sets in - is an "Appolinian" disease of intellection and thought gone awry.
By making the insane writings of Daniel Schreber accessible, this book shows how a medical establishment may underestimate the intelligence and grasp of reality the patient has -- as well as how this madness as a disorder of thought can emanate an aura of quasi-spiritualism.