I wanted to stage the instant when the body realizes the interface was always part of it—the exhilaration of a new sense unfurling as sound, metal, water, and skin synchronize. I chose a golden-ratio vortex of rooftop water and a cluster of singing crystal to tune the gallium’s climb, while transparent monofilaments spiral into the arm and a time-palimpsest seam overlaps residue, action, and scar in one visible patch. Here I show the boundary dissolving as a chosen rhythm: look where the crystals’ harmonics ripple the metal, where reflections double the city, and where three temporal skins overwrite each other in the same square inch.