Exploring Visible-Body Proportion as a Potential Observational Dimension: BPI Conceptual Equation Layer v0.2

This public concept note explores whether visible-body proportion may warrant a more structured observational language layer distinct from body mass and internal body-composition analysis. Existing systems such as Body Mass Index (BMI) and Bioelectrical Impedance Analysis (BIA) remain valuable for describing body mass and estimating internal composition variables. However, these systems were not originally designed to describe visible-body proportion relationships, silhouette transitions, structural balance, or longitudinal visible-body organization. This note introduces BPI (Body Proportion Index) as a preliminary conceptual language for discussing visible-body proportion interpretation as a potentially complementary observational dimension. The document conceptually discusses relational variables such as: - Upper Difference (UD)- Lower Difference (LD)- Balance Gap (BG) Specific scoring thresholds, computational weighting systems, calibration logic, protected interpretation-engine details, and implementation rules are intentionally not disclosed in this note. This archive is exploratory, non-clinical, non-diagnostic, and intended solely for open scholarly discussion, methodological exploration, and future interdisciplinary refinement. Version:v0.2 — Public Concept NoteOpen for community feedback and interdisciplinary refinement.