Human physiology serves as a living archive of our evolutionary past, yet certain localized reflexes remain profound biological anomalies. One of the most striking is the "Waterline" Paradox of human piloerection. While microscopic histology confirms the structural retention of arrector pili muscles on the dorsal surfaces of the hands and insteps, macroscopic observation reveals a complete functional deactivation of the pilomotor reflex in these specific distal zones. This paper argues that this discrepancy is not a random anatomical error, but a targeted, software-level evolutionary vestigialization. By resolving the conflict between histological presence and macroscopic absence, we introduce the concept of the "Littoral Extremity". We propose that this precise neural deactivation, functioning alongside aquatic skin wrinkling, represents a highly specialized adaptation to the severe tidal mechanics and coastal foraging environments of early hominins. Ultimately, this localized physiological boundary provides a crucial biological marker supporting the broader macroevolutionary framework of the Lunar Gravity Plough.
Dmytro Vechirko (Sun,) studied this question.