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Every plate is one seed: the same number carves the stone and tunes the pad. The cave is generated as a branching tree of swelling oval cross-sections — tunnels can split into sub-caves, each receding to its own vanishing dark — then drawn in ink: wobbled contour lines, perspective hatching, cross-hatch shading that thickens with depth. The track is a walk down the cave's deepest branch: each depth slice is a section, the harmony steps as you descend, a split swings the key further, the filter closes with depth, and the terminal dark fades the piece out — every cave is its own complete track, deterministic from the seed. Template mode renders the same plate as a non-photo-blue construction drawing — the true 3D wireframe of the cave surface, cross-section rings and longitudinal flow lines, with a crosshair at every hole and registration marks — print it and ink the final drawing by hand over the generated bones.