Version 7 update: This version: Clarifies the status of Lorentz invariance as an emergent infrared property, emphasizing that any Lorentz-violating microstructure must be dynamically suppressed in order for general relativity to arise as the effective universality class. Strengthens the interpretation of gravity as a collective transverse–traceless shear response of a condensed elastic spacetime medium, with scalar and vector modes generically suppressed by disorder. Adds a numerical disordered-network toy study (Appendix A) illustrating mode localization and the survival of a shear-dominated, TT-like subset without fine tuning or symmetry enforcement. Sharpens the interpretation of black holes as phase-boundary regions corresponding to spacetime failure at finite critical strain, rather than geometric singularities. Improves conceptual clarity, structure, and internal consistency throughout, while preserving phenomenological agreement with general relativity in its tested domain. No changes are made to the fundamental assumptions or predicted infrared behavior of the framework. --- Version 6 update: This version introduces a clarifying conceptual refinement regarding the physical interpretation of spacetime and its foundational lineage. A brief paragraph has been added to situate the proposed elastic substrate framework within the operational foundations of general relativity, explicitly connecting it to Einstein’s use of idealized rods and clocks as primitive standards for geometry and time. This addition emphasizes that the present work does not modify general relativity in its regime of validity, but instead addresses a prior structural question: what physical substrate must exist for such operational notions to be well-defined at all. No changes are made to the core assumptions, mechanisms, or phenomenological conclusions of the framework. The update is purely interpretive and explanatory, strengthening conceptual continuity with established relativistic principles while preserving the original scope and intent of the paper. --- Version 5 update: This version introduces a clarified physical interpretation of time dilation within the emergent spacetime framework. Specifically, the revision emphasizes that gravitational and kinematic time dilation arise not from changes in local matter dynamics or clock mechanisms, but from geometric reconfiguration of the spacetime condensate itself. Atomic processes remain locally identical in all inertial frames; differences in elapsed time reflect variations in the number of underlying spacetime reconfiguration steps along distinct worldlines, rather than altered internal rates. This clarification aligns the framework more closely with the geometric foundations of general relativity, reinforces compatibility with local Lorentz invariance at observable scales, and addresses common intuition-level objections to medium-based or emergent spacetime models. No new particles, forces, or low-energy deviations are introduced. Version 5 remains a conceptual and structural refinement of the original proposal. Core assumptions, phenomenology, and conclusions are unchanged. ---Version 4 update: This version refines and consolidates the conceptual foundations of the framework while preserving all core conclusions of earlier versions. This update clarifies the role of non-local pre-geometric structure in enforcing universality of the emergent spacetime phase. In particular, it emphasizes that prior to condensation the substrate admits no notion of geometric locality, distance, or adjacency, implying that the instability driving spacetime formation acts globally rather than regionally. As a result, the system cannot fragment into inequivalent macroscopic phases during condensation, and instead flows robustly toward a single infrared universality class. The revised presentation strengthens the structural justification for: uniqueness of the emergent spacetime phase, robustness of the transverse–traceless shear sector, suppression of scalar and vector gravitational modes at long wavelengths. No new phenomenological claims are introduced. The update is interpretive and structural, improving conceptual clarity and internal coherence without altering the theory’s predictions or scope. Earlier versions remain valid conceptual precursors. --- Version 3 update: This version clarifies the non-geometric, non-local nature of the substrate introduced in Version 2, explicitly distinguishing pre-condensed substrate dynamics from emergent spacetime locality, causality, and time. The minimal three-dimensional arena is retained solely as a physical setting for locking, strain, and failure, not as spacetime. All core results are unchanged; this version represents a conceptual consolidation of the theory. --- Version 2 update: This version revises the substrate ontology from a purely one-dimensional formulation to a minimal three-dimensional pre-geometric arena, while preserving the original emergent spacetime, gravity, and black-hole mechanisms. The update resolves mechanical and topological limitations of the earlier formulation (e.g., locking, knotting, and strain localization) without altering the core conclusions. Version 1 remains a valid conceptual precursor. --- Spacetime, gravity, and cosmology are traditionally treated as fundamental ingredients of physical theory. In this work, we present a framework in which spacetime instead arises as a condensed, elastic phase of a non-geometric substrate composed of one-dimensional degrees of freedom. A tachyonic instability drives condensation, suppressing vibrational motion and producing a frozen, disordered node–edge lattice. Geometry emerges as a coarse-grained descriptor of the lattice’s elastic response, while gravitational dynamics correspond to transverse–traceless shear modes that survive disorder and dominate the infrared behavior, reproducing general relativity as a universality class. The Planck scale is reinterpreted as a critical strain threshold at which the condensed spacetime phase fails, rather than as a fundamental ultraviolet cutoff. Black holes correspond to regions of spacetime melting bounded by high-entropy interfaces, naturally yielding area-law entropy and preserving information via transfer to the underlying substrate. Cosmological features such as inflation, large-scale homogeneity, and late-time acceleration are interpreted as consequences of global condensation, phase ordering, and residual elastic relaxation. The framework provides concrete structural constraints, falsifiability conditions, and observational windows, while avoiding spacetime singularities and Planck-scale particle assumptions. It offers a unified physical picture in which spacetime is emergent, metastable, and subject to mechanical failure under extreme strain.