Reality organizes itself through interfaces, boundaries that constrain interaction while enabling coordination. These interfaces stack hierarchically, each layer building upon the ones below, creating new possibilities through accumulation rather than replacement.

The Complete Interface Stack

Explore each layer of the hierarchy stack:

Layer 1

Physical Interfaces

The Foundation of Reality

Symmetries, conservation laws, fields, and particles. The most fundamental level of reality, before life or mind enter the picture.

  • Symmetries as source code
  • Conservation laws as boundaries
  • Fields and particles as stable patterns
Layer 2

Thermodynamic Interfaces

Managing Entropy, Creating Order

Interfaces that allow entropy to be exported while maintaining local order. Enables complexity to emerge from simple processes.

  • Entropy management
  • Dissipative structures
  • Far-from-equilibrium systems
Layer 3

Spacetime Interfaces

The Framework of Interaction

Creates the framework within which everything else operates. Establishes locality and causality.

  • Locality constraints
  • Causality structure
  • Foundation for all interaction
Layer 4

Biological Interfaces

Self-Maintaining Boundaries

Introduces active self-maintenance. Membranes, regulatory networks, and metabolic pathways that maintain life.

  • Cell membranes
  • Active self-maintenance
  • Autonomy and persistence
Layer 5

Sensorimotor Interfaces

Bridging Organism and Environment

Perception and action loops that enable agency. Active engagement with the world.

  • Active perception
  • Purposeful action
  • Emergence of agency
Layer 6

Cognitive Interfaces

Creating Intelligence and Selves

Predictive models, attention mechanisms, and inferential processes. Creates intelligence and the self.

  • Markov blankets
  • Predictive models
  • Hierarchy of selves
Layer 7

Semantic Interfaces

Stabilizing Meaning Across Systems

Language, symbols, and ontologies that enable meaning to stabilize and be shared. Creates knowledge and culture.

  • Shared meaning
  • Language as boundary
  • Ontologies as contracts
Layer 8

Social Interfaces

Coordinating Behavior Across Individuals

Norms, institutions, and legal frameworks that enable cooperation and collective action.

  • Social norms
  • Institutions
  • Collective action
Layer 9

Technological Interfaces

Consciously Designed Systems

APIs, protocols, and user interfaces explicitly designed by humans. Shows how we can consciously design what nature discovers.

  • APIs and protocols
  • User interfaces
  • Conscious design