In Nietzsche's Perspectivism, Steven Hales and Rex Welshon offer an analytic approach to Nietzsche's important idea that truth is perspectival. Drawing on Nietzsche's entire published corpus, along with manuscripts he never saw to press, they assess the different perspectivisms at work in Nietzsche's views with regard to truth, logic, causality, knowledge, consciousness, and the self. They also examine Nietzsche's perspectivist ontology of power and the attendant claims that substances and subjects are illusory while forces and alliances of power constitute the only reality.
 
Hales and Welshon present Nietzsche's treatment of perspectivism as both more complex and more fruitful than the common view of it as a doctrine that truth is not objective. Neither a metaphor nor a methodology, perspectivism emerges as a protean concept akin to a unifying theme; an alternative to the absolutism that recurs in science, philosophy, and religion; and a technique for revealing the unimagined possibilities open to every individual.