Arlong Park Spiral Emblem
The seed
Why it matters
recent-chapter: the spiral-as-fish-man-cultural-emblem register may pre-load the Ryugu-Palace / Fish-Man Island architectural-spiral-motifs that recur at Ch. 612+. The chapter’s new-angle-confirms-the-emblem compositional grammar is structurally background-symbol persistence — Oda preserves the spiral across compositional variants of the same building.