Soil phase interaction diagram maps the three-phase composition of soil—solid particles, pore water, and air—and their mechanical behavior under applied loads. The architecture traces how soil composition determines consolidation response, stress transmission between particles, and effective stress distribution using the fundamental equation σ' = σ − μ. This framework is essential for predicting settlement, designing foundations, and understanding how saturated versus unsaturated soils respond differently to loading. Fork and customize this diagram to teach soil mechanics concepts, embed it in geotechnical design documents, or adapt it for site-specific soil characterization studies.