What has Robert Pirsig written?

Some works openly refer to themselves as 'non fiction novels.' The definition of such works remains vague. The term was first widely used in reference to the non-autobiographical 'In Cold Blood' by Truman Capote but has since become associated with a range of works drawing openly from autobiography. A central focus of the non-fiction novel is the development of plot through the means of fictional narrative styles. The emphasis is on the creation of a work that is essentially true, often in the context of an investigation into values or some other aspect of reality. The books Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig and The Tao of Muhammad Ali by Davis Miller open with statements admitting to some fictionalising of events but state they are true 'in essence.'