HCCPR — Human-Centered Concave Planetary Reference Toward a Conceptual Spatial Anatomy of the Earth

Planetary representations are predominantly constructed from an external, convex point of view inherited from cartography and orbital observation. While mathematically rigorous, these representations remain perceptually detached from the conditions under which humans experience the Earth.This paper introduces the Human-Centered Concave Planetary Reference (HCCPR), a conceptual framework that repositions the observer at the center of planetary representation and expresses the Earth as a surrounding, concave spatial environment. Grounded in a broader approach termed Conceptual Spatial Anatomy, HCCPR does not seek to replace existing cartographic models nor to propose a new physical geometry of the planet. Instead, it reveals the perceptual and cognitive assumptions embedded in dominant global representations and offers a complementary referential aligned with human spatial experience. Through a methodological sequence combining classical projection, radial inversion, and perceptual recomposition, this work articulates two complementary representational modes—analytical and experiential—aimed at improving interpretative coherence in planetary visualization, climate communication, and global spatial reasoning.