Spreads the gap’s tension across the work so no single boundary becomes a hard wall.
Opened-square landmark: U vertex · k ∨ ¬k
Excluded middle at the kernel — the both-sides position, strictly below everything. At an ordinary kernel, this landmark is the cell's canonical representative — the skeleton of the four-position partition.
One of four structural positions in the framework. The same position recurs across every domain — that recurrence is the claim.