This work presents a systematic investigation of the CIG Hypothesis (Cradle-Icosahedron-Geometrodynamics), an ambitious attempt to derive the phenomenology of the physical world from the geometric tension between two perfect solids — a sphere and a cube — at the Planck scale. The hypothesis unfolds across three progressive levels: the Cradle Theory, which describes the dynamics of expansion and collapse; the integration with the Geometrodynamic Particle Model, which connects the emerging structures to extremal black holes and Calabi-Yau manifolds; and the completion with F-Theory, which provides a mathematical framework for deriving fundamental constants. The goal of this work is not to present a definitive theory, but rather to explore, with intellectual honesty, the successes, limits, and open questions of this working hypothesis. The results are of a mixed nature: Remarkable successes:• The derivation of the dark matter/baryon ratio ΩDM/Ωb = 2πR ≈ 5.287, in agreement with Planck data within 0.8%.• The derivation of the muon-electron mass ratio mμ/me = 2^(π√6), with an error of 0.001%, and a detailed demonstration of its uniqueness based on independent geometric constraints.• The reproduction of seven fundamental constants with percent precision (Boltzmann constant, proton-electron product, Weinberg angle, spectral index).• A surprising internal consistency check linking the Calabi-Yau vacuum energy to the energy released in the SmallBang within 1.2%.• The identification of a deep harmonic structure: the frequencies of the internal cycles form a dominant seventh chord (DO-FA♯-SI♭), and the memory frequencies (f1, f3, f4) produce resonances at f ≈ 0.137, a universal A note. Limits and discrepancies:• In the quark sector, the model correctly reproduces the orders of magnitude for charm (1.29 GeV, expected 1.28), bottom (3.07 GeV, expected 4.18), and down (0.00689 GeV, expected 0.0048), but fails dramatically for top (lighter by a factor of 130), strange (heavier by a factor of 14), and up (heavier by a factor of 1550).• The calculated CKM matrix exhibits mixing elements of order unity, while experimental values are of order 10^-1 - 10^-3, indicating that the near-degeneracy of second and third generation down positions (y2^d ≈ y3^d) conflicts with data.• The formula for the fine structure constant α^-1 = 125π^2/9, while remarkably accurate (0.03%), is acknowledged as a numerological observation rather than a derivation from first principles. The work concludes with ten falsifiable predictions for experiments of the coming decade (CMB-S4, LISA, HL-LHC, DUNE, etc.) and with a critical synthesis outlining directions for future research. The CIG hypothesis, in its current form, is not a consolidated theory, but a collection of partial results, honestly evaluated, which together tell the story of a fascinating geometric idea, with some notable successes and some clear failures. The true judge, as always, will be the ability to predict new phenomena. Keywords:CIG hypothesis, CKM matrix, dark matter, Kaluza-Klein modes, warped extra dimensions, F-Theory, fundamental constants, extremal black holes, spacetime harmonics, critical analysis.