In the usual order of things, lives run their course and eventually one becomes who one is. Bodily and psychic transformations do nothing but reinforce the permanence of identity. But as a result of serious trauma, or sometimes for no reason at all, a subject's history splits and a new, unprecedented persona comes to live with the former person - an unrecognizable persona whose present comes from no past and whose future harbors nothing to come; an existential improvisation, a form born of the accident and by accident. Out of a deep cut opened in a biography, a new being comes into the world...