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Gilles Deleuze (1925–1995)

Deleuze built a philosophy of difference — not difference as the negation of identity (A is different from B because it is not-B) but difference in itself, as a positive, productive force that is prior to identity. Difference and Repetition (1968) argues that Western philosophy has subordinated difference to identity, treating it as secondary — the deviation from a type, the space between two things. Deleuze inverts the hierarchy: difference is the primary reality; identity is what emerges when differences are stabilised. The move connects to Bergson’s duration (continuous qualitative change), to Nietzsche’s eternal return (the return of difference, not of the same), and to Spinoza’s immanence (a single plane of reality without transcendent organising principles). With Félix Guattari, Deleuze extended the philosophy into politics, psychoanalysis, and social theory in Anti-Oedipus (1972) and A Thousand Plateaus (1980) — works that introduced the concepts of the rhizome, assemblage, deterritorialisation, and the body without organs.

Life

Born 18 January 1925 in Paris. Studied philosophy at the Sorbonne (agrégation, 1948). His early career was devoted to historical studies of individual philosophers — monographs on Hume (1953), Nietzsche (1962), Kant (1963), Bergson (1966), Spinoza (1968, 1981), Leibniz (1988), and Foucault (1986). Each book was also a creative transformation: Deleuze read his subjects against the grain, extracting concepts and putting them to work in new contexts. “The history of philosophy is the reproduction of philosophy itself” — the monographs are not commentary but philosophical construction conducted through other thinkers.

Taught at various lycées and universities, then professor of philosophy at the University of Paris VIII (Vincennes, later Saint-Denis) from 1969 until his retirement in 1987. Vincennes was the experimental university founded in the wake of May 1968; its atmosphere of intellectual radicalism suited Deleuze’s work.

The collaboration with Guattari — a psychoanalyst and political activist — began in 1969 and produced four joint works. The collaboration was unusual: two thinkers with different training, different styles, and different institutional positions producing work that neither could have produced alone. Deleuze described the method as “writing between the two.”

Deleuze suffered from a respiratory illness that worsened through the 1980s and 1990s. He committed suicide on 4 November 1995 in Paris.

Difference and repetition

Différence et répétition (1968) — Deleuze’s doctoral thesis and his most sustained philosophical work. The argument:

Western metaphysics has understood difference through identity: a thing differs from another because it departs from a shared type. Difference is derivative — it presupposes the identity it departs from. Deleuze argues that this gets the order wrong. Difference is primary; identity is what emerges when differences are stabilised, repeated, and recognised. The “I” is not a substance that then encounters differences; it is constituted through the differences that flow through it.

Repetition is not the return of the same. Genuine repetition produces difference — each repetition of a pattern modifies it, because the context has changed. The eternal return (Nietzsche) is the return of difference, not of identity: what returns is the capacity for difference, not the same thing again. Deleuze reads this as an ontological principle: being is becoming; identity is the stabilisation of a differential process.

The philosophical targets are Hegel (who subordinates difference to dialectical negation — difference as the “not” that drives synthesis) and the Platonic tradition (which subordinates copies to originals). Deleuze’s alternative: a “philosophy of immanence” in which everything operates on a single plane, without transcendent organising principles, without original-and-copy hierarchies, without negation as the motor of change.

The rhizome, assemblages, and the Guattari collaboration

Mille Plateaux (A Thousand Plateaus, 1980, with Guattari) introduces the concepts that have been most widely adopted outside philosophy:

The rhizome. Against the tree model (hierarchical, branching, rooted), the rhizome is a network without a centre — any point can connect to any other, and the structure has no beginning, no end, and no hierarchy. The rhizome is not a metaphor for a particular kind of thing; it is a model of organisation that can be applied to biological, social, linguistic, and conceptual systems. Deleuze and Guattari contrast “arborescent” thinking (tree-like, classificatory, hierarchical) with “rhizomatic” thinking (networked, connective, non-hierarchical).

Assemblages (agencements). A configuration of heterogeneous elements — bodies, machines, statements, territories — that functions as a whole without being unified by a single principle. An assemblage is not an organism (which has an internal organising principle) and not a mechanism (which has a designer); it is a temporary, contingent coming-together of components that produces effects irreducible to any one component. The concept has been widely adopted in social theory, geography, science studies, and political ecology.

Deterritorialisation and reterritorialisation. Processes by which assemblages break apart (deterritorialisation) and reconfigure (reterritorialisation). The movement is continuous: every configuration is a temporary stabilisation of forces that are always capable of recombining differently.

Where Deleuze stops

The philosophy of difference has been criticised for its resistance to critical evaluation. If identity is always derivative and difference is always primary, it becomes difficult to say when one configuration is better than another — the framework generates descriptions of how things differ and change but is less equipped to generate normative judgments about when change is for the better. Alain Badiou — Deleuze’s most sustained philosophical critic — argued that Deleuze’s philosophy of difference is ultimately a philosophy of the One disguised as a philosophy of the Many: the single plane of immanence, the univocity of being, is itself a totalising principle that absorbs all differences into a single ontological register. Whether this critique is fair (Deleuze would deny that immanence is totalising) or whether it identifies a genuine structural problem in the philosophy is debated.

The Guattari collaboration produced work of extraordinary range and invention — Anti-Oedipus and A Thousand Plateaus are among the most ambitious philosophical works of the twentieth century — but the density and inventiveness of the writing has been a barrier to critical engagement. The texts generate concepts (rhizome, assemblage, deterritorialisation, body without organs, war machine, smooth and striated space) at a rate that outpaces their systematic development. Peter Hallward has argued that Deleuze’s philosophy, taken to its conclusions, is a philosophy of “creation” that has no adequate account of situated, embodied, political action — that the emphasis on flows, becomings, and virtual potentials leaves the actual and the concrete undertheorised.

The reception has been split along disciplinary lines. In continental philosophy, Deleuze is a central figure — one of the most influential philosophers of the second half of the twentieth century. In analytic philosophy, he is largely ignored or dismissed as obscure. Whether this reflects a genuine disciplinary limitation in Deleuze’s work or a limitation in the analytic tradition’s capacity to engage with it depends on which side of the divide is asking.

Key works

See also: Bergson · Whitehead · Connolly · Process philosophy · Structuralism · Philosophy of organism