Complex Thinking (pensée complexe) is a philosophical and epistemological approach that embraces interconnection, contradiction, and emergence as fundamental features of knowledge and reality. Developed primarily by French sociologist and philosopher Edgar Morin, complex thinking rejects reductionist separatism in favor of a holistic, dialogical method that weaves together seemingly opposed domains and principles.
The term itself derives from the Latin "complexus," meaning "woven together." Complex thinking is not merely "complicated" thinking—it is a conscious methodology for understanding how systems, ideas, and phenomena are fundamentally linked and mutually constitutive.
Core Principles
1. The Principle of Interconnection (Linking)
The foundational act of complex thinking is linking (relier in French)—but not mere sequential connection. Morin emphasizes "looping" connections where relationships return on themselves and become self-generative.
"We have learned too well how to separate. It is better to learn how to link. Linking means not only establishing a connection end-to-end, but establishing a connection that loops back on itself. In linking is the 're'—the return of the loop onto itself. The loop is self-productive." — Edgar Morin
This principle underpins why Systems thinking and Radiant thinking are essential PKM practices—they map and honor the looping, self-reinforcing nature of ideas.
2. Dialogics (Principle of Dialogism)
Dialogic thinking unites two opposing or contradictory principles while maintaining their autonomy and complementarity. Rather than resolving contradictions through synthesis, dialogics holds them in productive tension.
Examples:
- Order and disorder: Organization arises from both structure and randomness; neither alone creates life
- Identity and change: Systems maintain identity while constantly transforming
- Part and whole: Parts constitute wholes, yet wholes possess emergent properties exceeding their parts
This principle directly challenges binary, either/or reasoning common in Western logic. For PKM, this means holding competing ideas in creative tension—e.g., the tension between Tension - Receptive vs Active Creativity or Tension - Milieu vs Serendipity.
3. Hologrammatic Principle
The whole is present (somehow) in every part, and parts are co-present in the whole. Like a hologram, knowing one part offers insight into the system; the system shapes each part.
This explains emergence: wholes exhibit properties not predictable from parts alone, yet the parts are necessary to the whole. A neuron doesn't "contain" consciousness, but consciousness emerges from the neural network.
For knowledge work, this suggests that Individual notes contain echoes of the entire vault; each entry points to and is shaped by the system's whole.
4. Auto-Eco-Organization
Living systems are simultaneously autonomous (self-organizing) and dependent (organized by and within their environment). They cannot be understood in isolation or as passive recipients of environmental shaping—they are both.
"A living being can be understood only because it autonomizes and eco-organizes to exist. In other words, a living being can be thought only within, against, or with its environment—that is, its auto-ecology." — Edgar Morin
For PKM systems, this implies that your vault is neither purely your own creation nor entirely shaped by external inputs. It is a live, self-organizing ecology that feeds on external sources while maintaining its own integrity.
Concrete Vault Examples
Self-Organization Without External Input:
- A note you write captures your unique synthesis; two readers ingesting the same sources would generate different permanent notes based on their respective priors
- Tag hierarchies emerge organically—you don't design them top-down, but notice clusters and relationships forming as notes accumulate
- Backlinks reveal unexpected connections; the vault's link structure self-organizes through your linking decisions without pre-planned architecture
Dependency on Environment:
- Readwise highlights feed raw material into your vault; without external reading, your notes stagnate
- Daily notes capture real-world events, conversations, and encounters; the vault cannot flourish in isolation from lived experience
- Spaced repetition reviews and periodic note-review rituals bring feedback from your larger knowledge ecosystem
The Dialogic Tension:
- You shape the vault (autonomous: deciding what to capture, how to structure, what tags matter)
- The vault shapes you (dependent: your thinking adapts as you navigate its structure, discover links you didn't consciously make, stumble upon forgotten insights)
- This mutual causation—you building the system that builds your thinking—is auto-eco-organization in action
The Autonomy-Dependency Balance:
- Over-engineering (top-down hierarchies, rules-heavy tagging, over-structure) violates autonomy: the vault becomes a rigid system you must feed
- Under-engineering (pure chaos, no linking, zero organization) violates ecology: the vault loses feedback loops and becomes noise
- The sweet spot: minimal structure that enables self-organization (e.g., Atomic notes + flexible tags + natural linking) while remaining open to external inputs and serendipity
5. Reflexivity (The Knower in Knowledge)
All knowledge is partial and situated. The observer, their tools, values, and historical context are inseparable from what they observe. Thus, genuine knowledge requires reflexive awareness of this embedding.
Morin argues that knowledge must be "knowledge of knowledge"—including metacognitive awareness of the knower's own interdependencies and blind spots.
This principle is foundational to Epistemic Humility, Calibration and Epistemic Humility, and the practice of noting your confidence levels and epistemic status in vault entries.
Layers of Complex Thinking
Morin structures his method in three tiers:
- Logical-philosophical layer: The principles above (dialogics, holography, auto-eco-organization, reflexivity)
- Methodological layer: Concrete methods for applying these principles to research and learning
- Organizational layer: How to structure institutions, education, and collective knowledge to embody complex thinking
For PKM practitioners, the first two layers are most actionable—understanding the principles and developing practices (like Linked notes, Connected Notes, Bidirectional Linking) that embody them.
Contrasts with Reductionist Thinking
| Reductionist | Complex |
|---|---|
| Breaks wholes into parts for analysis | Maps relationships and emergence |
| Isolates variables | Studies interactions and feedback loops |
| Seeks a single unifying principle | Holds multiple principles in tension |
| Either/or logic | Both/and dialogical logic |
| Observer neutral | Observer embedded and reflexive |
Reductionist thinking is not "wrong"—it is essential for certain domains (chemistry, medicine). But applied universally, it blinds us to emergence, feedback, and system-level phenomena that cannot be predicted from parts alone.
Relevance to PKM
Complex thinking reshapes how we approach knowledge management:
- Atomic notes should still honor their interdependencies; isolated notes are incomplete
- Tags and links are not metadata overlays but expressions of the actual web of meaning
- Synthesis and emergence happen through deliberate linking and re-linking, not through exhaustive summary
- Epistemic humility means flagging confidence, sources, and your own position in entries
- The knower (you) is part of the system; your vault reflects not objective truth but your situated understanding
Auto-Eco-Organization in Practice: The Vault as Living System
The auto-eco-organization principle offers a diagnostic lens for PKM health:
Signs of healthy auto-eco-organization:
- New notes naturally find connections without forced linking
- Feedback loops are visible (reviews surface forgotten notes, spaced repetition reveals gaps)
- The system remains permeable to external inputs (new sources, ideas, challenges) without losing coherence
- Tags and structure evolve as the vault grows, not rigidly imposed at the start
Signs of dysfunction:
- The vault feels like a burdensome system imposed on you (over-structured, too many rules)
- It's isolated from external inputs—a closed archive rather than a living knowledge ecology
- Links feel forced or artificial; notes don't naturally find kinship
- Feedback loops are broken (notes never resurface, no periodic review, no serendipitous re-discovery)
The goal is neither total autonomy nor total environmental responsiveness, but a dynamic equilibrium where the vault organizes itself in conversation with your reading, thinking, projects, and the world around you.
Open Questions
- How do we balance atomic decomposition (breaking into parts) with honoring emergence (seeing wholes)?
- How might complex thinking reshape curriculum and education design?
- Can AI systems (which operate via reductionist statistics) ever embody complex thinking, or do they require human reflexivity?
- What would a "complex thinking PKM" look like at scale—hundreds of thousands of notes held in dialogical relation?
- At what point does a vault's auto-eco-organization break down? Is there a maximum sustainable size without restructuring?
- How do periodic reviews (spaced repetition, scheduled resurfaces) function as feedback loops in auto-eco-organization?
References
- Morin, E. (1977–1991). Method: Towards a Study of Humankind (Volumes 1–4). Seuil.
- Morin, E. (1999). Seven Complex Lessons in Education for the Future. UNESCO.
- Morin, E. (2008). On Complexity. Hampton Press.
- Wikipedia (FR). Pensée complexe