Psychosis, an invasion of mind and body from without, creates an enigma about what is happening and thrusts the individual into radical isolation. What are the subjective details of such experiences? This book explores psychosis as knowledge cut off from history, truth that cannot be articulated in any other form. Delusion is a new language made of 'incandescent alphabets' that the psychotic adopts from imposed voices. The psychotic uses language in a singular way to found and explain a strange experience that he or she cannot exit. Through the exegesis of language in psychosis based on first person accounts, the book orients readers to an enigmatic Other, pervasive and inescapable, that will come to inhabit every aspect of the psychotic's being, thought and bodily experience. The book deploys a poetics as a form of inquiry to give a nuanced picture of delusion as a repair of language itself, following Freud and Lacan-in historic and contemporary forms of psychotic art, writing and speech.