This is a conceptual note — the version that makes the head click for a reader who has never seen the metrics. It is v7 of the unified explanation previously published as 10.5281/zenodo.17411019, now with all LISA sections removed. One postulate: Spacetime coherence is regulated by the interference of 8 phase fronts with step , where is the quantum brake from non-minimal coupling and , macro (Ivancho limit). 8 fronts cover not , deficit overflow cost of arrow of time, interference residue (0.03492 normalized), thermal margin only free parameter. Central Membrane Equation: , , vs Planck . The four numbers that make click are one bill: overflow = = cost of existence thermal margin = irreducible heat bill = light surviving near-cancellation, protection diameter = projection of onto 3D observable axis Antifrequency: is not negative Fourier frequency , but physical temporal density. Modulation , , saturates (100% enhancement). Transition kHz - kHz, max kHz enhancement. Validation DA Bkg, DB Bkg MAD , and non-Gaussian, SNR , cryogenic mK W/√Hz. Other pillars: Bit0 ( ) / Bit1 ( ) causal membrane, packing , BBO transducer, Casimir Pa at 100 nm contamination , Noise=Effective Lambda testable Euclid/Roman, Hawking kg excess PBH, HFCO , observer dilemma fly Hz vs human Hz. Falsifiable (No LISA): LHC TeV, IceCube-Gen2 TeV eV, excess PBH at kg Fermi-LAT AMEGO, Euclid/Roman , Casimir Pa, BBO correction. Zero free parameters beyond . One constant Planck / macro. One equation . One projection . Files: LaTeX (pdfLaTeX compatible, no unicode), PDF compiled, TXT plain ASCII. This is the pure conceptual note that makes click.