The Idea of the World is a compendium of ten peer-reviewed academic papers by the Dutch philosopher and computer scientist Bernardo Kastrup, published by Iff Books in 2019. The book systematises Kastrup's analytic-idealist case that consciousness — not matter — is the ontological primitive, and that what appears as the physical universe is the extrinsic appearance of a single field of phenomenal experience. Individual minds are described as 'dissociated alters' of that field, an analogy Kastrup draws from the clinical literature on dissociative identity disorder.
The case is mounted against materialism, bottom-up panpsychism, and constitutive cosmopsychism in turn, with each chapter a previously published journal article. Evidence is drawn from physics and neuroscience as well as from philosophy of mind. Kastrup's interlocutors include Donald Hoffman, Iain McGilchrist, and Federico Faggin on the sympathetic side, and Keith Frankish and Massimo Pigliucci among the critics, who argue that the dissociation move imports unexplained mental machinery rather than dissolving the hard problem of consciousness.
Reception
Kastrup is among the most-cited contemporary defenders of idealism in analytic philosophy and is a frequent interlocutor of Donald Hoffman, Iain McGilchrist, and Federico Faggin on the consciousness-studies podcast circuit; reviewers have praised the book's willingness to engage materialist, panpsychist, and constitutive-cosmopsychist alternatives on their own terms. Philosophers committed to physicalism (Keith Frankish, Massimo Pigliucci) have argued the dissociation move imports unexplained mental machinery rather than dissolving the hard problem of consciousness, while sympathetic critics within idealism (Miri Albahari, Itay Shani) have argued for variations on the cosmopsychist position Kastrup rejects. The volume has nonetheless become one of the standard references when contemporary idealism is taught at the graduate level.
Frequently asked
What is The Idea of the World about?
It is Bernardo Kastrup's most academically credentialled book: ten peer-reviewed papers making the case that consciousness — not matter — is the fundamental nature of reality (analytic idealism). Individual minds are presented as 'dissociated alters' of a universal field of experience.
What is analytic idealism?
Analytic idealism is Kastrup's label for the position that phenomenal consciousness is the ontological primitive and that the physical world is its extrinsic appearance. It is developed within the analytic philosophical tradition, engaging directly with materialism and panpsychism rather than with religious or contemplative sources.
How does Kastrup respond to the hard problem of consciousness?
Kastrup treats the hard problem as a problem with physicalist ontology rather than with consciousness itself. If consciousness is primary, the puzzle of how subjective experience arises from matter dissolves; what requires explanation instead is how a single experiential field comes to appear as an external, material world.