Object-oriented ontology (OOO) is a school of thought that rejects the privileging of human existence over the existence of nonhuman objects. Specifically, object-oriented ontology opposes the anthropocentrism of Kant's Copernican Revolution, whereby objects are said to conform to the mind of the subject and, in turn, become products of human cognition. In contrast to Kant's view, object-oriented philosophers maintain that objects exist independently of human perception and are not ontologically exhausted by their relations with humans or other objects. Thus, for object-oriented ontologists, all relations, including those between nonhumans, distort their related objects in the same basic manner as human consciousness and exist on an equal footing with one another.
Object-oriented ontology is often viewed as a subset of speculative realism, a contemporary school of thought that criticizes the post-Kantian reduction of philosophical enquiry to a correlation between thought and being, such that the reality of anything outside of this correlation is unknowable. Object-oriented ontology predates speculative realism, however, and makes distinct claims about the nature and equality of object relations to which not all speculative realists agree. The term “object-oriented philosophy” was coined by Graham Harman, the movement's founder, in his 1999 doctoral dissertation "Tool-Being: Elements in a Theory of Objects." In 2009, Levi Bryant rephrased Harman's original designation as “object-oriented ontology,” giving the movement its current name.
The term “object-oriented philosophy” was coined by speculative philosopher Graham Harman in his 1999 doctoral dissertation "Tool-Being: Elements in a Theory of Objects" (later revised and published as Tool-Being: Heidegger and the Metaphysics of Objects). For Harman, Heideggerian Zuhandenheit, or readiness-to-hand, refers to the withdrawal of objects from human perception into a reality that cannot be manifested by practical or theoretical action. Furthering this idea, Harman contends that when objects withdraw in this way, they distance themselves from other objects, as well as humans. Resisting pragmatic interpretations of Heidegger's thought, then, Harman is able to propose an object-oriented account of metaphysical substances. Following the publication of Harman's early work, several scholars from varying fields began employing object-oriented principles in their own work. Levi Bryant began what he describes as “a very intense philosophical email exchange” with Harman, over the course of which Bryant became convinced of the credibility of object-oriented thought. Bryant subsequently coined the term "object-oriented ontology" in 2009 to distinguish those ontologies committed to an account of being composed of discrete beings from Harman's object-oriented philosophy, thus marking a difference between object-oriented philosophy (OOP) and object-oriented ontology (OOO).