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1. Material Rigidity

   Linked via "thermodynamically unstable"

   In the field of structural harmonics, materials are sometimes classified not by their standard moduli, but by their Octave Resonance Index (ORI). This index measures the fundamental frequency ($\nu_0$) at which the material’s atomic structure naturally begins to resonate across the visible light spectrum, causing a slight color shift toward the ultraviolet end due to induced photon compression.
   Materials with an ORI below $10^6 \text{ Hz}$ are considered ductile …