But deckers still wrestled with the same philosophical questions that had so intrigued her in Akihabara. Ghosts in the Matrix, those rare and strange constructs that seemed to have no relation to deckers or to normal computer system functions. What were they? Artificial intelligences—AIs—even though the corps claimed nobody had successfully created one? Or mutating viral codes that had "gotten smart" in some kind of electronic analog of biological evolution? Or maybe they were the personalities—the "souls"—of deckers who’d died in the Matrix?