# Reality Revision 1.49 — Sun–Water Eye Observer

## Concrete addition

Matter Harmony Lab 0.6.0 adds a bounded ordinary-optics baseline for the
requested fixed Sun, moving water, and human observer.  The source is a fixed
distant 5772 K Planck spectrum.  A declared three-component linear gravity-wave
surface supplies height and normal at every ray origin.  For each wavelength,
the IAPWS R9-97 formulation supplies the water refractive index, and the engine
applies unpolarized Fresnel reflection and vector Snell refraction.  Refracted
ray density on an underwater plane produces the caustic image.

The finite observer is

\[
(X,Y,Z)^T=\int L(\lambda)\,[\bar x(\lambda),\bar y(\lambda),\bar z(\lambda)]^T\,d\lambda,
\]

using a declared analytic approximation to the CIE 1931 2-degree standard
observer, followed by a fixed sRGB display transform.  It is a population
standard-color surrogate, not a one-to-one retina or visual cortex.

## Checked result

The room-temperature index decreases from 1.345110691 at 380 nm to
1.328482654 at 780 nm; at 589.3 nm it is 1.332858051.  The corresponding
normal-incidence Fresnel reflectance is 0.02035830.  The 150-frame, 60 fps run
contains 48,988,800 ray–wavelength–exposure samples and produces a moving
spectral caustic.  All 65 tests pass.  A separate implementation checks the
optics, 9,331,200 RGB channel values, counterexamples, and video metadata.

## Corrections forced by the observer model

Human vision is not a universal measuring instrument.  The release constructs
two nonnegative spectra whose relative spectral separation is 0.709286 while
their XYZ responses differ by at most \(1.421\times10^{-14}\).  Thus the
observer map is many-to-one even before noise, adaptation, or neural processing
is considered.  Missing information after the eye transform cannot be assigned
to one hidden mechanism.

The movie is also not a hologram.  The engine transports expected spectral
energy, not a complex electromagnetic field, and fields with different
absolute phase have the same intensity.  Optical carriers span approximately
384–789 THz, but they are time-averaged; the 60 fps display rate only controls
how the rendered irradiance sequence is shown.  Temporal fusion does not
reconstruct optical phase or wavefront depth.

## Evidence boundary and next test

The IAPWS and CIE quantities are reference inputs; Snell/Fresnel optics and the
non-identifiability constructions are mathematics; the animation is finite
synthetic computation.  No new physical measurement was made.  Absorption,
scattering, diffraction, coherence, polarization-resolved transport, detailed
ocular optics, retina, and visual cortex remain absent.

The next falsifiable test is to freeze a measured water-surface height movie,
depth, camera geometry, and illumination, then score caustic ridge positions
and chromatic offsets on held-out frames without refitting.  A coherent
wave-optics branch must pass analytic phase-grating controls before being called
holographic.

Revision 1.14's complete deterministic closure remains idempotent.  Revision
1.15's integer-tick non-crossing limitation, angular-impulse formula, and
finite-prefix generator non-identifiability remain unchanged.  The recurrence
learner's \(2K\)-sample continuation guarantee still assumes a noiseless
homogeneous constant-coefficient linear recurrence of order at most \(K\) from
the initial state.  No seven physical dimensions, \(P=NP\), physical fifth
dimension, universal grid/tick, or theological identification is inferred.