First on-page canonization of the Grand-Line-entrance-lighthouse landmark. The lighthouse is the spatial-marker that closes the East-Blue saga’s geographic install — the entrance to the Grand Line is here visually materialized as a coastal lighthouse.
The framing is structurally inverted from standard lighthouse-semiotics:
Standard lighthouse = warning (rocks ahead, danger).
Loguetown lighthouse = guidance (the way to the Grand Line, the destination).
The guiding-light framing pre-loads:
Reverse Mountain ascent (Ch. 101-102) — the lighthouse marks the approach to Reverse Mountain (Twin Cape), the actual mechanical entrance to the Grand Line via current-confluence.
Crocus the lighthouse-keeper (Ch. 102+) — the lighthouse-keeper-as-guide register pays off via Crocus, Roger’s former ship-doctor who tends the lighthouse at Twin Cape.
The Grand-Line-as-destination-not-detour semiotic frame — pirates seek the Grand Line; the lighthouse guides them in, not away.