The literal reading of his votes: nscbiz's left rail becomes a continuous drawn line; his sketches are mounted ON it as milestones; chapter labels stick beside it while evidence scrolls. The safest, most legible anatomy.
1. The spine is one SVG path, always faintly complete (ghost) and inked by reading progress; milestones are his real sketches, circular-cropped ON the line.
2. Sticky chapter labels ride the spine (decadree/fruitful vote) instead of floating in content.
3. One ground event only: the better-question chapter inverts (dioda: black as a frame, not a surface).
4. Mark-and-return is spine-native: marked lines pin as small ticks on the spine and gather at its end-star beside the form.
5. The living mark sits at the spine's head and rotates gently at chapter changes (harriet vote).
6. Risk: closest to v1's One Line/Through Line lineage; must out-craft them or feels like a redo.
7. Mobile keeps a real (thin) spine at the left edge; nothing is hidden horizontally.