The breadth of the Reality Kernel: the same formalism across many physical bodies, compositions, and mathematical readings.
P.I.G.M.I.E. Filing 1 · patent pendingA Reality Kernel is a structure, not a single gadget. The kernel formalism stays the same while the physical substrate, the composition, and the mathematical reading vary. A substrate is the physical medium that carries the kernel process. This page maps that breadth.
Only the digital projector-camera Truth Beam is demonstrated and recomputable. The other embodiments named here are described and enabled in Filing 1 (Description PDF) as part of the research project - not a claim of demonstration. The basic physical apparatus has been explored so far to a limited extent, and their physical envelope is still being characterised.
The reactor is the optional physical medium that can sit in the kernel's path. When present, it receives an emitted pattern and produces a response, which is then fed back into later emission. It is not one device. It is a family of possible embodiments.
The bench anchor uses a sealed fluorescent or scattering medium. Filing 1 also gives, as non-limiting examples, a CRT or phosphor analogue-memory reactor, a spatial light modulator and scattering media, fibre-delay loops, acoustic or cymatic reactors, phase-change and metasurface media, spiking-photonic integrated circuits, and degenerate cases where the detector or the emitter is itself the reactor (expanded below).
Reactors also nest. Filing 1 describes a Matryoshka architecture, distinct from a layered stack that a signal traverses in series: two or more concentric or enclosed structures, each a reactor in its own right, with the inner reactor immersed in the electromagnetic, acoustic, or thermal environment established by the outer one rather than receiving light that has passed through it. A cavity within a cavity - a microwave cavity enclosing a smaller Penning-trap cavity, a Fabry-Perot cavity enclosing a scattering medium, an acoustic resonator enclosing an optical reactor. Because the inner reactor's transfer function depends on the boundary conditions the outer reactor imposes, modulating the outer boundaries continuously reshapes the whole environment the inner reactor lives in, and the inner reactor's own response becomes a probe of that reshaping. A non-limiting architecture, enabled in the filing.
The kernel formalism is identical across these cases. Only the physical substrate changes.
The degenerate end of the family is worth spelling out, because it means the reactor role can collapse into hardware already in the loop. Filing 1 describes a detector-as-reactor mode: starve a CMOS sensor of light - very low illumination, very short exposure, high gain - and each pixel's readout becomes primarily a sample from that pixel's own noise distribution rather than a record of incident light. Every pixel reports its own physics: shot noise from photon arrival, read noise set by transistor geometry and fabrication tolerances, a dark-current rate that varies pixel to pixel with crystal defects and localised contamination, and fixed-pattern noise, a spatial scar from manufacturing that is stable over time and unique to the die. The projector then programs the energy landscape: the illumination pattern biases each pixel's distribution without overwhelming it, the sensor's physics performs the sampling, and the committed record logs both the illumination controls and the noisy readout.
The emitter has the mirror-image mode. Bias a semiconductor laser at or just below threshold, or pulse it near the lasing onset, and its turn-on delay stutters stochastically from pulse to pulse, with statistics set by the specific die's spontaneous-emission factor and carrier lifetime. Its intensity-noise spectrum is shaped by that die's relaxation-oscillation frequency and damping; in multi-mode sources, mode competition adds partition statistics of its own. The emitted field becomes a sample from the source's noise distribution, shaped by the programmed bias point.
Run both at once and one beam carries two independent fingerprints, source and detector. The filing notes they are partially separable by frequency: modulate the emitter at known frequencies and compare the detector readout at those frequencies against the rest of the spectrum, and the two signatures can be characterised independently from a single record.
None of the underlying physics is novel, and Filing 1 cites the prior art: PRNU camera fingerprinting and photonic PUFs established that sensors and sources carry device identity. What the filing adds around them is the closed loop, the regime framework, and the committed record. The usual caveats travel with the territory: dark current and hot-pixel patterns drift with temperature, exposure, and age, and emitter noise drifts with temperature, bias, optical feedback, and age, so enrolment spans multiple operating points and verification uses fuzzy extraction or helper data to ride out drift. Uniqueness is established empirically, per device, not assumed.
This is the hardware restatement of the flying-spot point on the core page: you can already run the canonical loop with a hand-swept laser and your own eye. The camera and the laser you already own are not just detector and emitter. Each is already a reactor, and its physics is already in the record.
In the figure the slow loop is a cathode-ray reactor: an electron gun and yoke write onto a phosphor screen, which a rolling-shutter camera reads back. The phosphor is a physical analogue memory. Its afterglow does not vanish the instant the beam moves on; it persists and decays over a finite window, so each read carries a time-integrated trace of what was written before. That persistence is a finite memory horizon, a bounded span over which state is carried from one emission into the next. A reactor that holds memory gives the kernel a temporal state rather than an instantaneous response: the output at any moment depends on recent history, not on the present probe alone.
Fig. 4 stacks two timescales under one controller. A fast optical loop mixes and scatters at the nanosecond scale; its bandwidth-reduced response is written into the slow phosphor loop at tens of hertz, and the camera reads the accumulating phosphor state. The slow loop supplies the memory the fast loop lacks. Coupling a memory-bearing medium into the path makes the physical channel richer and harder to reproduce, because reproducing an output now means reproducing a history inside a device-specific persistence medium, not just a single response. This is a non-limiting example from Filing 1; its physical envelope is still being characterised.
The loop is the feedback path from emission through response into later conditioning. Substrates differ in how this path is closed.
Where feedback passes through a buffer, the loop advances in discrete steps. A buffer is a store that holds an intermediate state between one response and the next emission. The buffer may be an analogue-memory store, such as a CRT or phosphor loop, or a digital frame.
The limiting continuous embodiment dispenses with buffering. The loop is closed optically through a gain medium. Emission, response, and conditioning then proceed as one uninterrupted analogue process.
A lock-in measurement recovers a faint signal by modulating at a known reference frequency and keeping only what returns in phase with that reference. Filing 1's sweeping-reactor embodiments do this with a declared internal frequency: one reactor parameter is modulated at a fixed rate, and phase-sensitive demodulation extracts the derivative of the transfer function along that one dimension.
Filing 1 then describes a generalisation, scene-phased full-parameter sweeping, that removes the internal oscillator altogether. A declared spectral-peak or phase-tracking method extracts a reference signal from the scene's own return dynamics, and the device modulates its full configuration parameter vector in phase with it. The lock-in reference is the scene itself. Demodulated against that reference, the in-phase output is, to first order, the directional derivative of the coupled transfer function along the modulated direction, and cycling through a spanning set of directions recovers the full gradient as a physical measurement, without a differentiable surrogate model of the channel.
Two consequences follow in the filing's text. Anything that oscillates at the modulation frequency but is not phase-coherent with the scene is rejected, including the device's own internal artefacts. And the measurement is conditioned on the scene's dynamics, not its appearance: two scenes with identical static appearance but different internal dynamics produce different demodulated outputs, because the reference phase encodes the dynamics. A described method, enabled in the filing; its physical envelope is still being characterised.
The committed probe need not be visible light. Filing 1 describes infrared projection, where the probe is invisible to people in the scene, so the recording is not disturbed - an embodiment enabled in the filings, its physical envelope still being characterised.
Filing 1 develops this into a full private-colour architecture, and it is worth setting out whole, because the anti-spoofing layer falls directly out of its geometry. The sensing module is a modern camera obscura: the external scene images itself through the instrument's optics onto an internal screen, and a reality-side spectral filter at the aperture confines the reality channel to a declared visible pass-band. Reality paints the screen in RGB only; the infrared is excluded on the way in. The module works from that projection and never views the scene directly, which is the source of its environmental isolation, and the filter's parameters - pass-band, transmission profile, blocking ratio - are committed to the protocol digest.
A second channel reads the same screen from inside. An infrared laser and its detector are optically combined on a descanned path, one shared route out and back, so that as the beam sweeps the projected image the detector reads exactly the point the laser is lighting. The probe sits at a declared wavelength inside the filter's blocking band, where the scene's own light is filtered from ever supplying it, and its return is a veracity signal recovering the geometry, texture, and material of whatever is physically present.
The private colour is the logic of the two channels held together. The visible image is what the world says; the infrared return is what is physically there. Where the two disagree, the mismatch flags a projected or substituted fake. The probe wavelength, the scan pattern, the detector configuration, and the rule that turns the comparison into a verdict are all committed parameters of the protocol digest.
The same filter then inverts into a safety enclosure. Because the probe wavelength lies inside the reality-side filter's blocking band, the mechanism that keeps the world's infrared off the screen equally keeps the probe from exiting the guarded channel: by ordinary spectral selectivity and optical reciprocity the sensing channel is spectrally unidirectional, as the filing puts it. Filing 1 frames its scene-facing emitters as eye-safe under declared safety envelopes, and here the probe is further confined by the very filter that defines the security boundary, so the security property and the laser-safety property are one mechanism. Described in Filing 1; its physical envelope is still being characterised.
Filing 1 also describes deliberately driving the internal screen of its camera-obscura sensing layer with a projection rendered by a second Reality Kernel in place of the physics-driven scene image - a kernel-into-kernel docking configuration, and the mechanism behind the alignment layer's dream training. The driving apparatus can be as small as a projector built into the housing, or relay optics running the obscura's own path in reverse.
A single kernel can be assembled from expert subunits. An expert subunit is a specialised reactor assigned to a bounded part of the input space. A routing binding maps a given input to the appropriate expert. Capacity accounting bounds what each expert can represent.
This is the physical analogue of a mixture of experts. Many specialised reactors operate under one committed routing, with failover. The device can then scale without becoming a single opaque block.
A PolieBot is a proposed mobile Reality Kernel agent. In this embodiment, action in the world is permitted only through verification-gated channels. A verification-gated channel is an action path that opens only when the kernel has emitted committed evidence for the relevant state.
The kernel emits committed evidence. An action is permitted only against that evidence. Multiple kernels can corroborate before an irreversible action occurs.
No deployed PolieBot is claimed. This is the bridge to the Filing 2 runtime governance work, which bounds what such an agent is allowed to do.
The same kernel can be read through several branches of mathematics. A substrate lens is one such reading.
The filings name five such readings: an optical-primitives reading, a neural-architecture reading that treats the closed loop as a trainable network, an information-theoretic reading, a control-theoretic reading, and a cryptographic-primitives reading, grounded in measured hardness, that treats the channel as a physical function which is hard to reproduce.
These readings do not define separate objects. They describe the same structure from different fields. The Reality Kernel recurs across those fields, which is why the same formalism keeps applying.
The Reality Kernel · the core apparatus and formalism.
Regimes · the three objectives.
Assurance · why a capture is hard to forge.
Filing 1, Description PDF · the authoritative source for every embodiment named here; CITING · its IPFS CID and SHA-256.