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A spiral galaxy has no intrinsic handedness. Whether it appears to spin clockwise or counterclockwise depends entirely on which side of the disk faces the observer. In a statistically isotropic universe, random viewing angles should produce a perfect 50/50 split. But across multiple independent sky surveys, a persistent asymmetry has been reported. In these analyses, galaxies rotating in the opposite direction relative to the Milky Way appear more prevalent, and the reported asymmetry grows with redshift. In the deepest JWST fields, approximately 60% of classifiable spirals rotate in the opposite direction. This paper proposes that the asymmetry is the geometric shadow of the universe's underlying dimensional structure. Within the Emergent Plane (EP) framework (McGinty 2026a, 2026b, 2026c), we derive the Hemispheric Boundary Constraint: if mass enters three-dimensional space from a parity-conserving lower-dimensional boundary, the observable chirality fraction follows a direction-dependent function $P(\theta) = 1 - \theta/\pi$, where $\theta$ is the angle from the EP boundary normal. This function has a leading dipole amplitude of exactly $a_1 = 3/8$, with only odd multipoles contributing. The full-sky average is exactly 50%, but the directional signal is strong: a survey pointed at $\theta = 0$ (the EP pole) sees 100% majority chirality, while one at $\theta = 90°$ sees 50%. Gravitational mixing erases this signal over time, governed by a one-parameter thermalization curve. Using a major-merger timescale of approximately 4 billion years, the predicted directional signal is consistent with reported observations from SDSS (~0.5% excess at low redshift) through JWST (~60% at high redshift, corresponding to an effective survey direction approximately 72° from the EP pole), conditional on those observations reflecting genuine physical asymmetry. We also present results from a large-scale empirical search. We tested 273,055 spin-labeled galaxies against 26,111 galaxy clusters and 82,458 galaxy groups, looking for chirality coherence in dense environments. We found none. No signal at any scale, any membership definition, or any radius cut. We argue this null is not a failure but a prediction of the framework: the same mixing timescale that produces the high-redshift dipole predicts zero signal in clusters, where mixing is fast and thorough. Finally, we identify the observational test that will confirm or falsify the emergence prediction: three-dimensional spin-axis alignment of isolated hydrogen gas clouds in deep cosmic voids, measurable with next-generation radio surveys. Preliminary results from ALFALFA show that void-interior gas sources are systematically more gas-dominated than galaxies near walls, consistent with a less-processed population, though selection effects and small sample size (39 deep-void-interior sources) limit interpretation.