You are in The Observatory.
Ground you have walked is named. The rest is drawn but unnamed — it is waiting, not missing, and nothing is required of you to find it.
Every realm is named here, and its rooms fold open beneath it. The mark beside a name says which ground you have already walked.
Every door stays where you left it. Esc folds the map.
The name 'TwoEyes' (PascalCase), composed of atoms: two, eyes. Per-reader toggles living beside the board, never in it — no toggle may ever mutate meaning.