This paper explores the hypothesis that human perception evolved not to experience planetary motion, but to nullify it. Through geometric adaptation, our sensory systems resolve the Earth’s velocity into a perception of stillness. The paper argues that this is not a biological oversight, but a structured adaptation to a moving environment. By examining how entropy, time, and acceleration interact with rotational planetary systems, we propose that perception is a structured filter—a geometric equilibrium that renders motion undetectable at the meso-scale. The result is a reframing of stillness not as an illusion, but as an evolved perceptual output. The implications of this hypothesis open avenues for reconceptualizing time perception, planetary-scale cognition, and the biological interface between environment and motion.