A complete map lies face-up. Turn it over. Every sheet with a finished front has a back it can never show the one reading it — and for a map of the perceiver’s world, the back is the perceiver: the surface you read from. The one cell no reading can enter is the one you are standing on.
click any layer — that is the one you read from. Watch it go blank on the reverse: L0 · the root wall
LIT The asymmetry is exact and recomputed live: the front shows all 9 layers; the reverse shows 8 — every layer but the one you occupy — so front − back = 1, invariant across all nine standpoints. Completeness costs exactly one cell, and it is always the reader’s. The gate turns red if that difference is ever ≠ 1.
AMBER “reverse side” and “the reader” are a figure for an access asymmetry — a sheet has two faces and a reader occupies one, so from where they stand the other cannot be read. It is structural, not experiential: no mind, no interior, no feeling is claimed for the blank cell. This is [[the-complete-hierarchy]]’s own root wall read from the near side — ROOT0 held the far term (death) unwitnessed; the near term (the perceiver) is unwitnessable too, not because it is hidden far away but because it is where you are standing. Omote and ura, one sheet.