Nested Domain Reality (NDR)

Nested Domain Reality (NDR) is a conceptual framework proposing that observers do not experience an exhaustive, access-independent totality of reality, but rather an access-dependent domain selected from a larger, continuous structure. In this view, reality is organized as nested domains—conceptually similar to Russian dolls—where smaller, coherent regimes of description are contained within larger ones without requiring separation into different universes or disconnected worlds.

The framework introduces four core ideas: (i) domains as coherent regimes of description, (ii) a nesting relation among domains, (iii) access states that constrain what an observer can survive, detect, and decode, and (iv) a routing function that selects which domain is experienced.

Rather than proposing new particles, forces, or universes, NDR offers a unifying structural perspective: the world we experience is the domain selected by our current access conditions. The framework is intentionally agnostic about ultimate ontology and instead focuses on organizing how different, coherent descriptions of reality relate through nesting and access. It is designed to be testable in principle, open to refinement, and falsifiable if its core structural claims fail.

Biology: The human body is an ecosystem of trillions of cells containing vast communities of bacteria and microorganisms. At larger scales, organisms inhabit ecosystems within planetary environments. Life began in water, and all known life depends on it—cells maintain internal aqueous environments, bodies are mostly water, and Earth is largely a water world. This demonstrates nesting across scales without separation.

Physics & Instrumentation: What can be observed depends on scale, energy, and instrumentation. A microscope reveals cellular structures; a telescope reveals distant galaxies. Scuba gear provides access to underwater environments; spacesuits to outer space. These instruments do not create new worlds—they modify access states, changing which domains become observable and survivable.

Neuroscience: Perception is a constructed process. The brain builds models from limited sensory signals. In dreaming, especially REM sleep, the brain generates coherent, immersive worlds with minimal external input. Remarkably, external sounds (like a television) can be incorporated into dreams, showing that nested domains can influence each other without collapsing into one.

Not Multiverse: NDR emphasizes continuity rather than separation. Domains are nested and connected, not isolated. Routing is selection within one reality, not travel between different universes.

Not Many-Worlds: NDR does not require literal branching of reality. It focuses on access and selection, not on splitting histories. Domains are nested by scale and constraint, not by quantum branching.

Not Simulation: NDR is substrate-agnostic and makes no claims about computation, programmers, or external realities. It describes structural relationships regardless of ultimate substrate.

Not Holographic/Information-Only: While NDR recognizes projection and encoding, it does not claim a specific boundary mechanism or that reality is fundamentally informational.

NDR's unique contribution: explicit combination of nested domains, access states, routing as selection, and projection as limited experience.

NDR makes structural predictions that can be empirically evaluated:

• •Access Threshold Effects: Sharp transitions in observability when access conditions change (energy, scale, instrumentation)
• •Boundary Anomalies: Systematic discontinuities at domain boundaries not well-described by single-scale models
• •Projection Patterns: Information loss and coarse-graining across scales following systematic structural relationships
• •Nested Constraints: Higher-level domains systematically shaping possibilities in lower-level domains
• •Selection Without Transport: Apparent "world changes" explainable by access modifications rather than literal relocation

NDR is not a complete physical theory. It does not specify dynamical laws, equations of motion, or fundamental ontology. It provides a structural framework for organizing how different descriptions relate through nesting and access.

The routing function R(s) = d is conceptual. It expresses how access selects domains but is not yet derived from deeper physical mechanisms. Future work must connect this structure to concrete processes in neuroscience, physics, or information theory.

NDR would be falsified if:

• —A single, access-independent description proves complete at all scales
• —No meaningful access thresholds exist in practice
• —No projection-like information loss appears systematically
• —Routing must be understood as transport between separate realities