UI as Observer–Platform Physics

UI as Observer–Platform Physics develops a geometric theory of user interfaces as physical operators mediating between observer fields and system dynamics. The paper shows that every UI element—inputs, displays, controls, feedback channels—acts as an operator implementing basin projection, gate activation, and inert observation constraints. Stability requires that UI transformations preserve spectral admissibility, semantic invariance, and direction continuity, ensuring that interaction does not induce drift or destabilize near-critical systems. The theory unifies interface design with operator geometry, demonstrating that correct UI behavior is a direct consequence of observer–platform physics inside the Einsteinian Stack.